Fitment Guarantee·Free Shipping $50+·Hassle Free Returns
4.9· 19,069 customers|Fit guaranteed
4.9from 19,069 verified customers
|"Perfect fit, exactly what I needed!"— John D.
Dorman®Verified to fit 1,040 vehicles
| Vehicle | Trim | Engine | Notes |
|---|---|---|---|
| 1989 Chevrolet P20 | — | — | 11.15 In. Rear Brakes |
| 1989 GMC P2500 | — | — | 11.15 In. Rear Brakes |
| 1986 GMC P2500 | — | — | 11.15 In. Rear Brakes |
| 1985 Buick Regal | — | — | w/Hydraulic Booster; w/Power Brakes |
| 1985 Cadillac Eldorado | — | — | — |
| 1985 Oldsmobile Toronado | — | — | — |
| 1984 Cadillac Seville | — | — | — |
| 1984 Chevrolet G30 | — | V8 6.2L | w/Vacuum Power Brakes |
| 1984 GMC Caballero | — | — | — |
| 1984 GMC G3500 | — | L6 4.1L | w/Vacuum Power Brakes |
| 1984 GMC P2500 | — | L6 4.8L | 13 In. Rear Brakes |
| 1984 GMC P3500 | — | L6 4.8L | w/Vacuum Power Brakes |
| 1983 GMC Caballero | — | — | — |
| 1983 GMC G3500 | — | V8 5.7L | w/Vacuum Power Brakes |
| 1983 GMC P3500 | — | V8 5.7L | w/Vacuum Power Brakes |
WARNING: Handling passenger or off-highway motor vehicle parts can expose you to chemicals such as phthalates and lead, known to the State of California to cause cancer and reproductive harm. Service the vehicle in a well-ventilated area, wear gloves, and wash your hands. See www.P65Warnings.ca.gov/motor-vehicle-parts
Guaranteed fit — or free return
Currently out of stock
If a part we confirmed for your vehicle does not fit, we cover the return shipping and refund you in full. That is the fitment guarantee.
Nobody likes buying a part that turns out to be wrong. So if it doesn't fit, send it back for a full refund at no cost to you — return shipping is on us — and we'll help you get the right one.
Every part is covered for 24 months. Many brands add their own manufacturer warranty on top.
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The brand behind your
Brake Master Cylinder Reservoir Cap Gasket
Dorman builds this Brake Master Cylinder Reservoir Cap Gasket to original-equipment standards.
We do not list every part on earth — just the brands automakers actually trust. And we use AI to double-check not just the fitment but the product details on every listing, because we hate buying the wrong part as much as you do.
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The brands automakers actually put on the car. No white-label mystery boxes.
We're obsessed with fitment
Year, make, model, trim, engine — plus the fine print most sites skip — so it fits the first time.
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Dorman Brake Master Cylinder Reservoir Cap Gasket 42071
Out of stock · guaranteed fit or free return
Call for Price
888-477-2530Our parts specialists are ready to help you find the best price.
Call for Price
888-477-2530Our parts specialists are ready to help you find the best price.
Shipping calculated at checkout · Est. arrival Sat, Oct 31 to Sat, Oct 31
Ships To:This Dorman automotive component is engineered to meet or exceed OEM specifications for reliable performance and long service life.
Trusted Automotive Brand
Dorman is a trusted manufacturer of quality automotive parts.
View all Dorman productsThe brand behind your
Brake Master Cylinder Reservoir Cap Gasket
Dorman builds this Brake Master Cylinder Reservoir Cap Gasket to original-equipment standards.
The Dorman Brake Master Cylinder Reservoir Cap Gasket (42071) is a direct-fit replacement for 1968-1991 Chevrolet, GMC, Cadillac and 3 other makes. UPC 037495420716.
Brake Master Cylinder Reservoir Cap Gasket
The Dorman Brake Master Cylinder Reservoir Cap Gasket (42071) is a direct-fit replacement for 1968-1991 Chevrolet, GMC, Cadillac and 3 other makes. UPC 037495420716.
This Dorman automotive component is engineered to meet or exceed OEM specifications for reliable performance and long service life.
We only sell brands automakers trust, and we double-check the fit on every listing.
Top curated brands only
The brands automakers put on the car.
Obsessed with fitment
Year, make, model, trim, engine, plus the fine print.
Search any part number
Your old part, a competitor, or the dealer #. We confirm the match.
Shop owner? Get BuffyPro business pricing
Fitment Obsessed
Every part checked against your exact year, make, model, trim, and engine.
Wrong Fit? On Us.
Free return shipping, no restocking fee — the fitment guarantee.
Brands OEMs Trust
The names automakers actually put on the car.
Millions of Parts, One Promise
If we say it fits, it fits.
