Master Cylinder Caps
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Master Cylinder Caps Master Cylinder Caps
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Dorman - Help Master Cylinder Caps

Part No. 42042 Warranty Details  

See if this part fits a specific vehicle.

Check Vehicle Fit

Our Brake Master Cylinder Caps are engineered for affordability and convenience. Save time, money and labor by replacing only the Cap, instead of the entire Brake Master Cylinder.

Product Features:
  • Constructed of high-quality plastic for lasting durability
  • Available in diverse styles, including threaded and locking
  • Protects braking system by providing a tight seal against the elements
  • A necessary safety item, it prevents brake fluid from splashing and/or leaking
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by PowerReviews
Dorman - HelpMaster Cylinder Caps

(based on 3 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.

Reviewed by 3 customers

Displaying reviews 1-3

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I wouldn't buy this ever again


from Eldersburg, MD

Verified Buyer

Comments about Dorman - Help Master Cylinder Caps:

This cap fits extremely poorly. It rattles around so much that I'm fairly positive it will fall off. If it had a gasket, it possibly would fit tighter. But it also is lacking a locking point to keep it from unscrewing.

  • Was this a gift?:
  • No

Exact Fit


from Northern Indiana

Verified Buyer

Comments about Dorman - Help Master Cylinder Caps:

Manufactured by the same source as GM

  • Was this a gift?:
  • No

(1 of 1 customers found this review helpful)


just a cap


from confluence pa

About Me Auto Enthusiast, Casual Driver, Truck Enthusiast

See all my reviews

Verified Buyer
3 or more reviews submitted


  • Easy To Install


    Best Uses

    • Everyday Driving

    Comments about Dorman - Help Master Cylinder Caps:

    dont come with rubber seal cap only,,you have to buy seal extra,

    Displaying reviews 1-3

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    Do you have questions about this product?


    Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

    2 Questions | 2 Answers
    Displaying questions 1-2
    • Q:

      Does this cap fit on the rendezvous cxl?
      Asked on 3/21/2017 by Kimberly from AZ

      1 answer



        Hi Kimberly! To check the exact fit application for the part number 42042, please provide us with the year, make, model and engine size of your vehicle.

        Answered on 3/22/2017 by Steve from AAP
    • Q:

      Does this cap have a gasket included?
      Asked on 7/2/2011 by Jeff from Orlando, Fl

      1 answer

      • A:

        no gasket seperate

        Answered on 7/9/2011 by yo from yo
    Displaying questions 1-2

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    Disclaimer We strive to keep all information accurate and up-to-date; however, product availability, pricing, promotions and store hours are subject to change without notice. Please contact Customer Care if you have any questions or corrections.