2009 Audi S4 Brake Calipers

Brakes are designed as a system and all the parts need to work together for best performance. Industry brake service experts agree – when brake friction materials are ready to be replaced, the hardware is too. Caliper Guide Pins are important to replace because they hold the brake piston in place to create effective stopping performance.

Product Features:

• This part matches Original Equipment (OE) quality specifications
• Easy and fast replacement
• Ensures the brake pads are meeting the rotors at the correct angle for an even braking system
• Corrosion resistant coating for long-lasting durability against harsh roads
• Manufactured with quality materials to suppress high stress levels

An axle disc hardware kit with pins (upper/lower or inner/outer) that the caliper slides on. Replace old corroded pins and bolts which can hamper caliper movement and cause unnecessary and uneven pad wear.

This disc brake caliper bolt kit is designed to precisely tighten into stripped holes to easily repair the brake caliper or knuckle on specified vehicles. Made of quality components, this kit is engineered for reliable performance and durability.

Product Features:

• Direct replacement – this disc brake caliper bolt kit is designed to precisely tighten into stripped holes to easily repair the brake caliper or knuckle on specified vehicles
• Ideal solution – this kit provides is a reliable replacement for original hardware that has stripped
• Durable construction – this kit is made from quality components to ensure reliable performance and a long service life
• Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

An axle disc hardware kit with pins (upper/lower or inner/outer) that the caliper slides on. Replace old corroded pins and bolts which can hamper caliper movement and cause unnecessary and uneven pad wear.

PowerStop Performance Brake Calipers are made specifically with the enthusiast in mind. These calipers bolt directly in place of the stock calipers, and they look and perform great behind stock or custom wheels. PowerStop calipers and the brackets are remanufactured in our Chicago, IL facility and treated with a electrostatic high-temperature red powder-coating. The easy to clean powder coating helps to resist rust and corrosion thus extending the life of your calipers. PowerStop calipers are 100% pressure tested to verify piston operation and prevent any possible leaks from occurring. This insures that every caliper is inspected for quality and safety. PowerStop caliper pairs are expertly assembled using new seals, caliper guide pins, dust boots, bleeder screws, stainless steel brake pad abutment clips and mounting brackets. Our manual parking brake calipers are provided as a complete assembly to include all adjusting hardware, actuating levers, return springs, clips and bolts. High temperature EPDM rubber dust boots and premium silicone lubricant is used for a smoother operation and an extended life in extreme conditions. The performance color is a nice touch that really stands out behind your wheels!

Product Features:

• All calipers are thoroughly inspected for quality and safety. Pressure tested to prevent leaks.
• New seals, caliper guide pins, dust boots, bleeder screws, stainless steel brake pad abutment clips and mounting brackets
• High temperature EPDM rubber for extended life.
• Premium silicone lubrication provides smoother operation.
• The easy to clean powder coating helps to resist rust and corrosion and extends the life of calipers.
• Our manual parking brake calipers are provided as a complete assembly to include all adjusting hardware, actuating levers, return springs, clips and bolts

PowerStop Performance Brake Calipers are made specifically with the enthusiast in mind. These calipers bolt directly in place of the stock calipers, and they look and perform great behind stock or custom wheels. PowerStop calipers and the brackets are remanufactured in our Chicago, IL facility and treated with a electrostatic high-temperature red powder-coating. The easy to clean powder coating helps to resist rust and corrosion thus extending the life of your calipers. PowerStop calipers are 100% pressure tested to verify piston operation and prevent any possible leaks from occurring. This insures that every caliper is inspected for quality and safety. PowerStop caliper pairs are expertly assembled using new seals, caliper guide pins, dust boots, bleeder screws, stainless steel brake pad abutment clips and mounting brackets. High temperature EPDM rubber dust boots and premium silicone lubricant is used for a smoother operation and an extended life in extreme conditions. The performance color is a nice touch that really stands out behind your wheels!

Product Features:

• All calipers are thoroughly inspected for quality and safety. Pressure tested to prevent leaks.
• New seals, caliper guide pins, dust boots, bleeder screws, stainless steel brake pad abutment clips and mounting brackets
• High temperature EPDM rubber for extended life.
• Premium silicone lubrication provides smoother operation.
• The easy to clean powder coating helps to resist rust and corrosion and extends the life of calipers.

PowerStop Performance Brake Calipers are made specifically with the enthusiast in mind. These calipers bolt directly in place of the stock calipers, and they look and perform great behind stock or custom wheels. PowerStop calipers and the brackets are remanufactured in our Chicago, IL facility and treated with a electrostatic high-temperature red powder-coating. The easy to clean powder coating helps to resist rust and corrosion thus extending the life of your calipers. PowerStop calipers are 100% pressure tested to verify piston operation and prevent any possible leaks from occurring. This insures that every caliper is inspected for quality and safety. PowerStop caliper pairs are expertly assembled using new seals, caliper guide pins, dust boots, bleeder screws, stainless steel brake pad abutment clips and mounting brackets. High temperature EPDM rubber dust boots and premium silicone lubricant is used for a smoother operation and an extended life in extreme conditions. The performance color is a nice touch that really stands out behind your wheels!

Product Features:

• All calipers are thoroughly inspected for quality and safety. Pressure tested to prevent leaks.
• New seals, caliper guide pins, dust boots, bleeder screws, stainless steel brake pad abutment clips and mounting brackets
• High temperature EPDM rubber for extended life.
• Premium silicone lubrication provides smoother operation.
• The easy to clean powder coating helps to resist rust and corrosion and extends the life of calipers.

Brake Caliper

100% New Caliper – Manufacturer recommends replacing calipers in pairs. With innovative fixed and floating calipers in aluminum and nodular cast iron, ATE is Europe’s market leader. And there is a good reason for that: during development, ATE simulates operational stresses in terms of braking load, vibration, corrosion and wear in extensive series of trials. This means that every basic safety-relevant function is ensured, the sealing of the hydraulic system as much as the venting function of the piston (roll-back), the return (knock-back) function, or the function of the housing/pad guides. ATE original brake calipers are supplied ready-to-install: rear-axle calipers with handbrake are usually pre-filled and preset. This permits simple and correct bleeding in the vehicle.

Product Features:

• OE quality direct fit application.
• Friction Ready
• Corrosion inhibiting protection
• Ensures long life and maximum performance
• Natural exterior finish

Carquest Premium Brake Calipers are manufactured to meet or exceed original equipment manufacturer specifications for performance and durability. Where applicable, Carquest Premium Brake Calipers feature a specially formulated OE style zinc di-chromate anti-corrosion finish that provides superior rust protection in all conditions. Carquest Premium Brake Calipers feature new OE design, stainless steel pistons manufactured for maximum durability, and precision machined for an exacting fit and smooth application of braking force. Carquest Premium Brake Calipers include 100% new OE design dust boots and EPDM rubber seals that provide increased resistance to thermal deterioration and years of-leak free operation. Carquest Premium Brake Calipers include application-specific brackets and abutment hardware where required, for easy installation and confident restoration of stopping power. 100% end-of-line inspection and pressure testing guarantees perfect performance right out of the box.

Product Features:

• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• OE style, zinc di-chromate anti-corrosion finishes provide superior resistance to rust on all iron caliper bodies and brackets
• 100% new, OE style rubber dust boots and EPDM rubber seals for improved resistance to thermal deterioration and cracking
• New bleeder screws, banjo bolts, and crush washers included for a complete repair
• OE Style, stainless steel pad abutment hardware included
• 100% end-of-line inspection and pressure testing ensures quality and performance
• Caliper finish or coating may vary

100% New Caliper – Manufacturer recommends replacing calipers in pairs. With innovative fixed and floating calipers in aluminum and nodular cast iron, ATE is Europe’s market leader. And there is a good reason for that: during development, ATE simulates operational stresses in terms of braking load, vibration, corrosion and wear in extensive series of trials. This means that every basic safety-relevant function is ensured, the sealing of the hydraulic system as much as the venting function of the piston (roll-back), the return (knock-back) function, or the function of the housing/pad guides. ATE original brake calipers are supplied ready-to-install: rear-axle calipers with handbrake are usually pre-filled and preset. This permits simple and correct bleeding in the vehicle.

Product Features:

• OE quality direct fit application.
• Friction Ready
• Corrosion inhibiting protection
• Ensures long life and maximum performance
• Natural exterior finish

100% New Friction Ready Caliper – Manufacturer recommends replacing calipers in pairs. TRW Aftermarket Brake Calipers are born of market leading design and manufacture, all backed by more than 100 years of TRW experience as a premium quality automotive parts manufacturer. All TRW Aftermarket Brake Calipers are made to original equipment quality so you can fit great parts fast, with no comebacks. In fact, we’re so confident of the quality of our new and remanufactured Brake Calipers that the guarantee has been increased to three years, or a maximum of 60,000 miles (100,000 km.) TRW is a premium quality parts manufacturer, designing and building so much of the original equipment that vehicles are fitted with when they roll out of the factory, and you’ll get that same quality when you buy from TRW Aftermarket. For new replacement Brake Calipers, our aftermarket customers get the same OE/OES part quality, delivered from one of our five original equipment factories in Europe.

Product Features:

• All products are 100% end of line tested during production
• Every Brake Caliper is guaranteed for 60,000 miles (100,000km)

ATE Continental is further extending its range of Brake Caliper Pin Boot Kits for ATE brake calipers. ATE caliper Pin Boot Kits are an essential component of ATE-designed fist floating brake calipers. The floating caliper consists of a holder and housing, which is located in rubber damping pins and sleeves.

Product Features:

• Reduced cost
• OE Quality
• Complete Kit

Wearever Calipers feature steel pistons that are less likely to crack or deform under extreme pressure. Expertly remanufactured to rigorous quality and performance standards, they are are equipped with brand-new, premium components to guarantee exceptional longevity and reliability. These remanufactured brake calipers are 100% pressure-tested to deliver consistent, industry-leading brake performance. Each unit arrives with a complete set of brand-new hardware for a simple, complete installation. Caliper bracket is included when applicable.

Product Features:

• Steel pistons are durable, not prone to cracking and handle great loads.
• Rubber seals are replaced with new high temperature EPDM rubber for extended life and optimum performance.
• Mounting bracket is included where applicable for a hassle-free installation.
• Calipers are treated with a special formulated rust inhibitor and kept in the original equipment finish.
• New banjo bolts are included where applicable to ensure a perfect fit and quick installation.
• New bleeder screws provide trouble-free bleeding and a positive seal.
• New washers are included where applicable for a proper seal.
• A plastic cap plug protects every brake port thread to ensure trouble-free installation.
• New stainless steel hardware clips and new mounting pins are included where applicable.

Wearever Calipers feature steel pistons that are less likely to crack or deform under extreme pressure. Expertly remanufactured to rigorous quality and performance standards, they are are equipped with brand-new, premium components to guarantee exceptional longevity and reliability. These remanufactured brake calipers are 100% pressure-tested to deliver consistent, industry-leading brake performance. Each unit arrives with a complete set of brand-new hardware for a simple, complete installation. Caliper bracket is included when applicable.

Product Features:

• Steel pistons are durable, not prone to cracking and handle great loads.
• Rubber seals are replaced with new high temperature EPDM rubber for extended life and optimum performance.
• Mounting bracket is included where applicable for a hassle-free installation.
• Calipers are treated with a special formulated rust inhibitor and kept in the original equipment finish.
• New banjo bolts are included where applicable to ensure a perfect fit and quick installation.
• New bleeder screws provide trouble-free bleeding and a positive seal.
• New washers are included where applicable for a proper seal.
• A plastic cap plug protects every brake port thread to ensure trouble-free installation.
• New stainless steel hardware clips and new mounting pins are included where applicable.

Carquest Premium Brake Calipers are manufactured to meet or exceed original equipment manufacturer specifications for performance and durability. Where applicable, Carquest Premium Brake Calipers feature a specially formulated OE style zinc di-chromate anti-corrosion finish that provides superior rust protection in all conditions. Carquest Premium Brake Calipers feature new OE design, stainless steel pistons manufactured for maximum durability, and precision machined for an exacting fit and smooth application of braking force. Carquest Premium Brake Calipers include 100% new OE design dust boots and EPDM rubber seals that provide increased resistance to thermal deterioration and years of-leak free operation. Carquest Premium Brake Calipers include application-specific brackets and abutment hardware where required, for easy installation and confident restoration of stopping power. 100% end-of-line inspection and pressure testing guarantees perfect performance right out of the box.

Product Features:

• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• OE style, zinc di-chromate anti-corrosion finishes provide superior resistance to rust on all iron caliper bodies and brackets
• 100% new, OE style rubber dust boots and EPDM rubber seals for improved resistance to thermal deterioration and cracking
• New bleeder screws, banjo bolts, and crush washers included for a complete repair
• OE Style, stainless steel pad abutment hardware included
• 100% end-of-line inspection and pressure testing ensures quality and performance
• Caliper finish or coating may vary

Carquest Premium Brake Calipers are manufactured to meet or exceed original equipment manufacturer specifications for performance and durability. Where applicable, Carquest Premium Brake Calipers feature a specially formulated OE style zinc di-chromate anti-corrosion finish that provides superior rust protection in all conditions. Carquest Premium Brake Calipers feature new OE design, stainless steel pistons manufactured for maximum durability, and precision machined for an exacting fit and smooth application of braking force. Carquest Premium Brake Calipers include 100% new OE design dust boots and EPDM rubber seals that provide increased resistance to thermal deterioration and years of-leak free operation. Carquest Premium Brake Calipers include application-specific brackets and abutment hardware where required, for easy installation and confident restoration of stopping power. 100% end-of-line inspection and pressure testing guarantees perfect performance right out of the box.

Product Features:

• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• OE style, zinc di-chromate anti-corrosion finishes provide superior resistance to rust on all iron caliper bodies and brackets
• 100% new, OE style rubber dust boots and EPDM rubber seals for improved resistance to thermal deterioration and cracking
• New bleeder screws, banjo bolts, and crush washers included for a complete repair
• OE Style, stainless steel pad abutment hardware included
• 100% end-of-line inspection and pressure testing ensures quality and performance
• Caliper finish or coating may vary

Carquest Premium Brake Calipers are manufactured to meet or exceed original equipment manufacturer specifications for performance and durability. Where applicable, Carquest Premium Brake Calipers feature a specially formulated OE style zinc di-chromate anti-corrosion finish that provides superior rust protection in all conditions. Carquest Premium Brake Calipers feature new OE design, stainless steel pistons manufactured for maximum durability, and precision machined for an exacting fit and smooth application of braking force. Carquest Premium Brake Calipers include 100% new OE design dust boots and EPDM rubber seals that provide increased resistance to thermal deterioration and years of-leak free operation. Carquest Premium Brake Calipers include application-specific brackets and abutment hardware where required, for easy installation and confident restoration of stopping power. 100% end-of-line inspection and pressure testing guarantees perfect performance right out of the box.

Product Features:

• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• OE style, zinc di-chromate anti-corrosion finishes provide superior resistance to rust on all iron caliper bodies and brackets
• 100% new, OE style rubber dust boots and EPDM rubber seals for improved resistance to thermal deterioration and cracking
• New bleeder screws, banjo bolts, and crush washers included for a complete repair
• OE Style, stainless steel pad abutment hardware included
• 100% end-of-line inspection and pressure testing ensures quality and performance
• Caliper finish or coating may vary

Carquest Premium Brake Calipers are manufactured to meet or exceed original equipment manufacturer specifications for performance and durability. Where applicable, Carquest Premium Brake Calipers feature a specially formulated OE style zinc di-chromate anti-corrosion finish that provides superior rust protection in all conditions. Carquest Premium Brake Calipers feature new OE design, stainless steel pistons manufactured for maximum durability, and precision machined for an exacting fit and smooth application of braking force. Carquest Premium Brake Calipers include 100% new OE design dust boots and EPDM rubber seals that provide increased resistance to thermal deterioration and years of-leak free operation. Carquest Premium Brake Calipers include application-specific brackets and abutment hardware where required, for easy installation and confident restoration of stopping power. 100% end-of-line inspection and pressure testing guarantees perfect performance right out of the box.

Product Features:

• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• OE style, zinc di-chromate anti-corrosion finishes provide superior resistance to rust on all iron caliper bodies and brackets
• 100% new, OE style rubber dust boots and EPDM rubber seals for improved resistance to thermal deterioration and cracking
• New bleeder screws, banjo bolts, and crush washers included for a complete repair
• OE Style, stainless steel pad abutment hardware included
• 100% end-of-line inspection and pressure testing ensures quality and performance
• Caliper finish or coating may vary

Carquest Premium Brake Calipers are manufactured to meet or exceed original equipment manufacturer specifications for performance and durability. Where applicable, Carquest Premium Brake Calipers feature a specially formulated OE style zinc di-chromate anti-corrosion finish that provides superior rust protection in all conditions. Carquest Premium Brake Calipers feature new OE design, stainless steel pistons manufactured for maximum durability, and precision machined for an exacting fit and smooth application of braking force. Carquest Premium Brake Calipers include 100% new OE design dust boots and EPDM rubber seals that provide increased resistance to thermal deterioration and years of-leak free operation. Carquest Premium Brake Calipers include application-specific brackets and abutment hardware where required, for easy installation and confident restoration of stopping power. 100% end-of-line inspection and pressure testing guarantees perfect performance right out of the box.

Product Features:

• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• OE style, zinc di-chromate anti-corrosion finishes provide superior resistance to rust on all iron caliper bodies and brackets
• 100% new, OE style rubber dust boots and EPDM rubber seals for improved resistance to thermal deterioration and cracking
• New bleeder screws, banjo bolts, and crush washers included for a complete repair
• OE Style, stainless steel pad abutment hardware included
• 100% end-of-line inspection and pressure testing ensures quality and performance
• Caliper finish or coating may vary

Remanufactured Caliper – Manufacturer recommends replacing calipers in pairs. CARDONE brake calipers are remanufactured to match the exact look and function of the original equipment unit. Cardone calipers come ‘friction ready’ allowing you to select your favorite brand of brake pad. Cardone completely disassembles every worn part, also known as a core, and thoroughly clean and inspect every component. Through reverse engineering, Cardone engineers pinpoint original equipment design weaknesses through examining common wear areas and incorporate fixes into our renewal process as needed to produce a highly reliable caliper.

Product Features:

• OE Quality -Direct fit application
• 100% O.E.-specific rubber seals ensure like-new performance.
• 100% pressure testing guarantees proper braking function on the vehicle.
• Copper washers are included for a perfect seal.
• Every Friction Choice Caliper consistently includes all hardware needed to ensure quick, convenient installation, while offering you the choice to install your own preferred grade of pads.
• Friction Choice Calipers are offered with or without mounting bracket, so you can choose the configuration that best meets your needs.
• New bleeder screws provide trouble-free bleeding and a positive seal.
• Plastic cap plug in brake port line protects threads before installation.

Carquest Premium Brake Calipers are manufactured to meet or exceed original equipment manufacturer specifications for performance and durability. Where applicable, Carquest Premium Brake Calipers feature a specially formulated OE style zinc di-chromate anti-corrosion finish that provides superior rust protection in all conditions. Carquest Premium Brake Calipers feature new OE design, stainless steel pistons manufactured for maximum durability, and precision machined for an exacting fit and smooth application of braking force. Carquest Premium Brake Calipers include 100% new OE design dust boots and EPDM rubber seals that provide increased resistance to thermal deterioration and years of-leak free operation. Carquest Premium Brake Calipers include application-specific brackets and abutment hardware where required, for easy installation and confident restoration of stopping power. 100% end-of-line inspection and pressure testing guarantees perfect performance right out of the box.

Product Features:

• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• Meets or exceeds original equipment specifications for performance and durability
• OE design stainless steel pistons provide maximum durability and are precision machined for a perfect fit in the caliper body
• Application-specific caliper bodies for easy installation
• Brackets included where required, for complete system restoration
• OE style, zinc di-chromate anti-corrosion finishes provide superior resistance to rust on all iron caliper bodies and brackets
• 100% new, OE style rubber dust boots and EPDM rubber seals for improved resistance to thermal deterioration and cracking
• New bleeder screws, banjo bolts, and crush washers included for a complete repair
• OE Style, stainless steel pad abutment hardware included
• 100% end-of-line inspection and pressure testing ensures quality and performance
• Caliper finish or coating may vary

100% New Caliper – Manufacturer recommends replacing calipers in pairs. With innovative fixed and floating calipers in aluminum and nodular cast iron, ATE is Europe’s market leader. And there is a good reason for that: during development, ATE simulates operational stresses in terms of braking load, vibration, corrosion and wear in extensive series of trials. This means that every basic safety-relevant function is ensured, the sealing of the hydraulic system as much as the venting function of the piston (roll-back), the return (knock-back) function, or the function of the housing/pad guides. ATE original brake calipers are supplied ready-to-install: rear-axle calipers with handbrake are usually pre-filled and preset. This permits simple and correct bleeding in the vehicle.

Product Features:

• OE quality direct fit application.
• Friction Ready
• Corrosion inhibiting protection
• Ensures long life and maximum performance
• Natural exterior finish

100% New Caliper – Manufacturer recommends replacing calipers in pairs. With innovative fixed and floating calipers in aluminum and nodular cast iron, ATE is Europe’s market leader. And there is a good reason for that: during development, ATE simulates operational stresses in terms of braking load, vibration, corrosion and wear in extensive series of trials. This means that every basic safety-relevant function is ensured, the sealing of the hydraulic system as much as the venting function of the piston (roll-back), the return (knock-back) function, or the function of the housing/pad guides. ATE original brake calipers are supplied ready-to-install: rear-axle calipers with handbrake are usually pre-filled and preset. This permits simple and correct bleeding in the vehicle.

Product Features:

• OE quality direct fit application.
• Friction Ready
• Corrosion inhibiting protection
• Ensures long life and maximum performance
• Natural exterior finish