Dorman - HELP Brake Master Cylinder Reservoir Cap P/N:42042
$8.99
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Seal your brake fluid against moisture and grime with the Dorman - HELP Brake Master Cylinder Reservoir Cap 42042. This cap closes off the top of the master cylinder fluid reservoir, keeping brake fluid contained while helping keep dirt and moisture out. It installs as a direct-fit replacement across a broad range of GM cars, trucks, and SUVs — including the 1987-2005 Buick Century, 2008-2024 Buick Enclave, 1996-2005 Buick LeSabre, 2013-2019 Cadillac ATS, 2003-2019 Cadillac CTS, 2002-2014 Cadillac Escalade, 1992-2019 Chevrolet Corvette, 2007-2022 Chevrolet Equinox, and 1999-2014 & 2019-2024 Chevrolet Silverado 1500. See the Buyer's Guide tab for the full 151-application list.
Sealing job: caps the brake master cylinder reservoir to retain fluid and help keep out contaminants and moisture.
Direct-fit replacement: a direct-fit cap for the listed GM applications.
Conditional fix: if a cracked, warped, or missing cap is the cause of fluid loss or contamination, this replaces it.
It caps the master cylinder fluid reservoir, keeping brake fluid contained while helping keep dirt and moisture out of the brake hydraulic system.
Will it fit my vehicle?
It's a direct-fit replacement for many GM applications. Check the Buyer's Guide tab to confirm the correct year, make, and model for your vehicle before ordering.
What are signs I may need a new reservoir cap?
A cracked, warped, or missing cap, or brake fluid that appears dark or contaminated, can be signs the cap should be replaced.
What's included in this listing?
This listing is for the brake master cylinder reservoir cap only. It does not include the master cylinder or reservoir body.
What part numbers does this cap interchange with?
It replaces numbers such as 18013963, 18014091, 84047902, and 84917020, among the others shown in the Interchange section above.
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Dorman - HELP
Dorman - HELP Brake Master Cylinder Reservoir Cap P/N:42042
Seal the top of your brake master cylinder and help keep moisture and debris out with the Dorman - HELP Brake Master Cylinder Reservoir Cap (MPN 42040). It drops in as a direct-fit replacement across...
This brake master cylinder cap is designed to match the fit and function of the original cap on specified vehicles, and is engineered for durability and reliable performance.Master Cylinder...
This brake master cylinder cap is designed to match the fit and function of the original cap on specified vehicles, and is engineered for durability and reliable performance.Master Cylinder...
Seal the top of your brake master cylinder reservoir and help keep your brake fluid clean with the Dorman - HELP Brake Master Cylinder Reservoir Cap 42046. This cap closes off the master cylinder...
Seal brake fluid in and keep dirt and moisture out with the Dorman - HELP Brake Master Cylinder Reservoir Cap 42038. This screw-on cap threads onto the brake master cylinder reservoir to close off...
WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
