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Q:what does JB3 / JB5 brake mean? How do I determine what is on the vehichle?
A:With reference to your inquiry on the Moog Coil Spring Set - Part No. 6452, the JB3 and JB5 brake systems are difference in the rotor thickness and rear shoe width. The JB3 rotors are 1 inch thick and the JB5 rotors will be 1.25 inches thick. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.