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Dorman 42071 Brake Master Cylinder Reservoir Cap GasketOE Quality 60-Day Returns
Part #: 42071

Dorman 42071 Brake Master Cylinder Reservoir Cap Gasket

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285 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Chevrolet, GMC, Buick, Cadillac, Oldsmobile, and Pontiac, P30, P3500, P20, P2500, Regal, Riviera, Eldorado, Seville, Toronado, G30, Caballero, G3500, Corvette, Fleetwood, C10 Suburban, C20, C20 Suburban, C30, G10, G20, K10 Suburban, K20, K20 Suburban, K30, P10, C1500 Suburban, C2500, C2500 Suburban, C3500, G1500, G2500, K1500 Suburban, K2500, K2500 Suburban, K3500, P1500, C15 Suburban, C25, C25 Suburban, C35, G25, G35, K15 Suburban, K25, K25 Suburban, K35, P15, P25, P35, Calais, DeVille, Camaro, Firebird, C20 Pickup, C30 Pickup, G20 Van, G30 Van, K30 Pickup, P10 Van, P30 Van, C35/C3500 Pickup, G25/G2500 Van, G35/G3500 Van, K35/K3500 Pickup, P15/P1500 Van, P35/P3500 Van, G10 Van, G15/G1500 Van, Electra, Estate Wagon, GS, GS 455, LeSabre, Skylark, Sportwagon, Wildcat, Bel Air, Biscayne, Brookwood, Caprice, Chevelle, El Camino, Impala, Kingswood, Monte Carlo, Nova, Townsman, 442, 98, Cutlass, Cutlass Supreme, F85, Vista Cruiser, Bonneville, Catalina, Executive, Grand Prix, GS 350, GS 400, Special, GTO, Tempest, Chevy II, and LeMans
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Not what you need? See all Brake Master Cylinder Reservoir Cap Gasket options

Brake Master Cylinder Reservoir Cap Gasket for OE Fit

Dorman 42071 is a rubber brake master cylinder reservoir cap gasket built to match the fit and function of the original gasket on specified vehicles. It is made for dependable sealing performance in brake master cylinder reservoir applications, including classic Chevrolet, GMC, Buick, Cadillac, Oldsmobile, and Pontiac models.

Key Features

  • Rubber construction for sealing at the brake master cylinder reservoir cap
  • OE-style fit and function for specified applications
  • Engineered for durability and reliable performance
  • Direct replacement for interchange part number 5455516
  • Part number 42071 for easy identification

Detailed Description

This brake master cylinder reservoir cap gasket is designed for vehicles that use a hydraulic brake system reservoir seal at the master cylinder cap. It helps maintain a proper seal between the cap and reservoir, supporting consistent brake fluid containment on applications such as Chevrolet Corvette, Chevrolet Camaro, GMC P3500, Buick Riviera, Cadillac Eldorado, and Pontiac Firebird. Dorman 42071 is a practical replacement for restoring the sealing surface on older brake systems where the original gasket has aged, hardened, or deteriorated.

This part cross-references 5455516 for the same application.

What It Is Used For

  • Replacing a cracked or hardened brake master cylinder reservoir cap gasket
  • Restoring a seal on a leaking or weeping master cylinder reservoir cap
  • Addressing brake fluid odor or residue around the reservoir opening
  • Correcting cap-to-reservoir sealing issues after brake service
  • Maintaining proper closure on hydraulic brake master cylinder reservoirs

Installation Notes and Fitment

Compatible With 1968-1982 Chevrolet Corvette, N/A; 1968-1969 Chevrolet Camaro, N/A; 1971-1974 Chevrolet Camaro, N/A, w/Manual Brakes; 1975 Chevrolet Camaro, N/A; 1968-1969 Pontiac Firebird, N/A; 1970-1974 Pontiac Firebird, N/A, w/Manual Brakes; 1975 Pontiac Firebird, N/A; 1985-1991 Chevrolet P30, N/A, w/Hydraulic Brakes; 1985-1991 GMC P3500, N/A, w/Hydraulic Brakes; 1985-1989 Chevrolet P20, N/A, 11.15 Inch Rear Brakes - Parking Brake Strut; 1985-1989 GMC P2500, N/A, 11.15 Inch Rear Brakes - Parking Brake Strut; 1975-1984 Chevrolet P30, N/A, Fits vehicles with Vacuum Power Brakes; 1979-1984 GMC P3500, N/A, Fits vehicles with Vacuum Power Brakes; 1975-1980 Chevrolet P20, N/A; 1979-1980 GMC P2500, N/A; 1968-1970 Pontiac Bonneville, N/A, w/Moraine Brakes; Front Disc Brakes; 1968-1970 Pontiac Catalina, N/A, w/Moraine Brakes; Front Disc Brakes; 1968-1970 Pontiac Grand Prix, N/A, w/Moraine Brakes; Front Disc Brakes; 1968-1969 Pontiac GTO, N/A, Front Disc Brakes; 1968-1969 Pontiac Tempest, N/A, Front Disc Brakes; 1968 Pontiac LeMans, N/A, Front Disc Brakes.

Before installation, confirm the reservoir cap style and brake system configuration against the vehicle listing. Clean the sealing surface thoroughly so the new gasket seats evenly and forms a proper seal.

Quality Assurance

Dorman designs this gasket to match original fit and function on listed applications, with a rubber construction selected for dependable sealing performance in brake service.

BrandDorman
Part Number42071
MaterialRubber
Package Contents1 Brake Master Cylinder Gasket

This part fits 285 vehicles. Search below:

YearMakeModelFuel TypePositionNotes
1991ChevroletP30DIESELN/Aw/Hydraulic Brakes
1991GMCP3500DIESELN/Aw/Hydraulic Brakes
1990ChevroletP30DIESELN/Aw/Hydraulic Brakes
1990GMCP3500DIESELN/Aw/Hydraulic Brakes
1989ChevroletP20DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1989ChevroletP30DIESELN/Aw/Hydraulic Brakes
1989GMCP2500DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1989GMCP3500DIESELN/Aw/Hydraulic Brakes
1988ChevroletP20DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1988ChevroletP30DIESELN/Aw/Hydraulic Brakes
1988GMCP2500DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1988GMCP3500DIESELN/Aw/Hydraulic Brakes
1987ChevroletP20DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1987ChevroletP30DIESELN/Aw/Hydraulic Brakes
1987GMCP2500DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1987GMCP3500DIESELN/Aw/Hydraulic Brakes
1986ChevroletP20DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1986ChevroletP30DIESELN/Aw/Hydraulic Brakes
1986GMCP2500DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1986GMCP3500DIESELN/Aw/Hydraulic Brakes
1985BuickRegalN/Aw/Hydraulic Booster; w/Power Brakes
1985BuickRivieraGASN/A
1985BuickRivieraDIESELN/A
1985CadillacEldoradoDIESELN/A
1985CadillacSevilleDIESELN/A
1985ChevroletP20DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1985ChevroletP30DIESELN/Aw/Hydraulic Brakes
1985GMCP2500DIESELN/A11.15 Inch Rear Brakes - Parking Brake Strut
1985GMCP3500DIESELN/Aw/Hydraulic Brakes
1985OldsmobileToronadoDIESELN/A
1984BuickRegalN/A
1984BuickRivieraGASN/A
1984BuickRivieraDIESELN/A
1984CadillacEldoradoDIESELN/A
1984CadillacSevilleDIESELN/A
1984ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1984ChevroletP20N/A13 In. Rear Brakes
1984ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1984GMCG3500N/AFits vehicles with Vacuum Power Brakes.
1984GMCP2500N/A13 In. Rear Brakes
1984GMCP3500N/AFits vehicles with Vacuum Power Brakes.
1984OldsmobileToronadoDIESELN/A
1983BuickRegalGASN/A
1983BuickRegalDIESELN/A
1983BuickRivieraGASN/A
1983BuickRivieraDIESELN/A
1983CadillacEldoradoDIESELN/A
1983CadillacSevilleDIESELN/A
1983ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1983ChevroletP20N/A13 In. Rear Brakes
1983ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1983GMCG3500N/AFits vehicles with Vacuum Power Brakes.
1983GMCP2500N/A13 In. Rear Brakes
1983GMCP3500N/AFits vehicles with Vacuum Power Brakes.
1983OldsmobileToronadoDIESELN/A
1982BuickRegalGASN/A
1982BuickRegalDIESELN/A
1982BuickRivieraGASN/A
1982BuickRivieraDIESELN/A
1982CadillacEldoradoDIESELN/A
1982CadillacSevilleDIESELN/A
1982ChevroletCorvetteN/A
1982ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1982ChevroletP20N/A13 In. Rear Brakes
1982ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1982GMCG3500N/AFits vehicles with Vacuum Power Brakes.
1982GMCP2500N/A13 In. Rear Brakes
1982GMCP3500N/AFits vehicles with Vacuum Power Brakes.
1982OldsmobileToronadoDIESELN/A
1981ChevroletCorvetteN/A
1981ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1981ChevroletP20N/A13 In. Rear Brakes
1981ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1981GMCG3500N/AFits vehicles with Vacuum Power Brakes.
1981GMCP2500N/A13 In. Rear Brakes
1981GMCP3500N/AFits vehicles with Vacuum Power Brakes.
1980CadillacFleetwoodN/ACommercial Chassis
1980ChevroletC10 SuburbanN/A
1980ChevroletC20N/A
1980ChevroletC20 SuburbanN/A
1980ChevroletC30N/A11 In. Rear Brakes
1980ChevroletCorvetteN/A
1980ChevroletG10N/A11.15 In. x 2.75 In. Brakes
1980ChevroletG20N/A
1980ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1980ChevroletK10 SuburbanN/A
1980ChevroletK20N/A
1980ChevroletK20 SuburbanN/A
1980ChevroletK30N/A11 In. Rear Brakes
1980ChevroletP10N/A
1980ChevroletP20N/A
1980ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1980GMCC1500 SuburbanN/A
1980GMCC2500N/A
1980GMCC2500 SuburbanN/A
1980GMCC3500N/A11 In. Rear Brakes
1980GMCG1500N/A11.15 In. x 2.75 In. Brakes
1980GMCG2500N/A
1980GMCG3500N/AFits vehicles with Vacuum Power Brakes.
1980GMCK1500 SuburbanN/A
1980GMCK2500N/A
1980GMCK2500 SuburbanN/A
1980GMCK3500N/A11 In. Rear Brakes
1980GMCP1500N/A
1980GMCP2500N/A
1980GMCP3500N/AFits vehicles with Vacuum Power Brakes.
1979ChevroletC10 SuburbanN/A
1979ChevroletC20N/A
1979ChevroletC20 SuburbanN/A
1979ChevroletC30N/A11 In. Rear Brakes
1979ChevroletCorvetteN/A
1979ChevroletG10N/A11.15 In. x 2.75 In. Brakes
1979ChevroletG20N/A
1979ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1979ChevroletK10 SuburbanN/A
1979ChevroletK20N/A
1979ChevroletK20 SuburbanN/A
1979ChevroletK30N/A11 In. Rear Brakes
1979ChevroletP10N/A
1979ChevroletP20N/A
1979ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1979GMCC1500 SuburbanN/A
1979GMCC2500N/A
1979GMCC2500 SuburbanN/A
1979GMCC3500N/A11 In. Rear Brakes
1979GMCG1500N/A11.15 In. x 2.75 In. Brakes
1979GMCG2500N/A
1979GMCG3500N/AFits vehicles with Vacuum Power Brakes.
1979GMCK1500 SuburbanN/A
1979GMCK2500N/A
1979GMCK2500 SuburbanN/A
1979GMCK3500N/A11 In. Rear Brakes
1979GMCP1500N/A
1979GMCP2500N/A
1979GMCP3500N/AFits vehicles with Vacuum Power Brakes.
1978CadillacEldoradoN/A
1978ChevroletC10 SuburbanN/A
1978ChevroletC20N/A
1978ChevroletC20 SuburbanN/A
1978ChevroletC30N/A11 In. Rear Brakes
1978ChevroletCorvetteN/A
1978ChevroletG20N/A
1978ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1978ChevroletK10 SuburbanN/A
1978ChevroletK20N/A
1978ChevroletK20 SuburbanN/A
1978ChevroletK30N/A11 In. Rear Brakes
1978ChevroletP10N/A
1978ChevroletP20N/A
1978ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1978GMCG25N/A
1978GMCG35N/AFits vehicles with Vacuum Power Brakes.
1977CadillacEldoradoN/A
1977ChevroletC10 SuburbanN/A
1977ChevroletC20N/A
1977ChevroletC20 SuburbanN/A
1977ChevroletC30N/A11 In. Rear Brakes
1977ChevroletCorvetteN/A
1977ChevroletG20N/A
1977ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1977ChevroletK10 SuburbanN/A
1977ChevroletK20N/A
1977ChevroletK20 SuburbanN/A
1977ChevroletK30N/A11 In. Rear Brakes
1977ChevroletP10N/A
1977ChevroletP20N/A
1977ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1977GMCG25N/A
1977GMCG35N/AFits vehicles with Vacuum Power Brakes.
1976CadillacDeVilleN/A
1976CadillacEldoradoN/A
1976CadillacFleetwoodN/A
1976ChevroletC10 SuburbanN/Aw/Moraine Brakes
1976ChevroletC20N/A
1976ChevroletC20 SuburbanN/Aw/Moraine Brakes
1976ChevroletC30N/A11 In. Rear Brakes
1976ChevroletCorvetteN/A
1976ChevroletG20N/A
1976ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1976ChevroletK10 SuburbanN/Aw/Moraine Brakes
1976ChevroletK20N/A
1976ChevroletK20 SuburbanN/Aw/Moraine Brakes
1976ChevroletP10N/A
1976ChevroletP20N/A
1976ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1976GMCG25N/A
1976GMCG35N/AFits vehicles with Vacuum Power Brakes.
1975CadillacDeVilleN/A
1975CadillacEldoradoN/A
1975CadillacFleetwoodN/A
1975ChevroletC20N/A
1975ChevroletC20 SuburbanN/A
1975ChevroletC30N/A11 In. Rear Brakes
1975ChevroletCamaroN/A
1975ChevroletCorvetteN/A
1975ChevroletG20N/A
1975ChevroletG30N/AFits vehicles with Vacuum Power Brakes.
1975ChevroletK20N/A
1975ChevroletK20 SuburbanN/A
1975ChevroletP10N/A
1975ChevroletP20N/A
1975ChevroletP30N/AFits vehicles with Vacuum Power Brakes.
1975GMCG25N/A
1975GMCG35N/AFits vehicles with Vacuum Power Brakes.
1975PontiacFirebirdN/A
1974CadillacDeVilleN/A
1974CadillacEldoradoN/A
1974CadillacFleetwoodN/A
1974ChevroletCamaroN/Aw/Manual Brakes
1974ChevroletCorvetteN/A
1974GMCG25/G2500 VanN/A
1974GMCG35/G3500 VanN/AFits vehicles with Vacuum Power Brakes.
1974PontiacFirebirdN/Aw/Manual Brakes
1973CadillacDeVilleN/A
1973CadillacEldoradoN/A
1973CadillacFleetwoodN/A
1973ChevroletCamaroN/Aw/Manual Brakes
1973ChevroletCorvetteN/A
1973GMCG15/G1500 VanN/A11.15 In. x 2.75 In. Rear Brakes; w/Manual Brakes
1973GMCG25/G2500 VanN/A
1973PontiacFirebirdN/Aw/Manual Brakes
1972CadillacDeVilleN/A
1972CadillacEldoradoN/A
1972CadillacFleetwoodN/A
1972ChevroletCamaroN/Aw/Manual Brakes
1972ChevroletCorvetteN/A
1972PontiacFirebirdN/Aw/Manual Brakes
1971CadillacDeVilleN/A
1971CadillacEldoradoN/A
1971CadillacFleetwoodN/A
1971ChevroletCamaroN/Aw/Manual Brakes
1971ChevroletCorvetteN/A
1971PontiacFirebirdN/Aw/Manual Brakes
1970BuickLeSabreN/Aw/Moraine Brakes
1970BuickRivieraN/Aw/Moraine Brakes
1970BuickSkylarkN/A
1970CadillacDeVilleN/A
1970CadillacEldoradoN/A
1970CadillacFleetwoodN/A
1970ChevroletBel AirN/A
1970ChevroletCapriceN/A
1970ChevroletCorvetteN/A
1970ChevroletEl CaminoN/AFront Disc Brakes
1970ChevroletImpalaN/A
1970ChevroletMonte CarloN/A
1970ChevroletNovaN/AFront Disc Brakes
1970Oldsmobile98N/AFront Disc Brakes
1970OldsmobileCutlassN/AFront Disc Brakes
1970OldsmobileCutlass SupremeN/AFront Disc Brakes
1970OldsmobileToronadoN/A
1970PontiacBonnevilleN/Aw/Moraine Brakes; Front Disc Brakes
1970PontiacCatalinaN/Aw/Moraine Brakes; Front Disc Brakes
1970PontiacFirebirdN/Aw/Manual Brakes
1970PontiacGrand PrixN/Aw/Moraine Brakes; Front Disc Brakes
1969BuickSkylarkN/AFront Disc Brakes
1969CadillacDeVilleN/A
1969CadillacEldoradoN/A
1969CadillacFleetwoodN/A
1969ChevroletBel AirN/AFront Disc Brakes
1969ChevroletCamaroN/A
1969ChevroletCapriceN/AFront Disc Brakes
1969ChevroletCorvetteN/A
1969ChevroletEl CaminoN/AFront Disc Brakes
1969ChevroletImpalaN/AFront Disc Brakes
1969PontiacBonnevilleN/Aw/Moraine Brakes; Front Disc Brakes
1969PontiacCatalinaN/Aw/Moraine Brakes; Front Disc Brakes
1969PontiacFirebirdN/AFront Disc Brakes
1969PontiacGrand PrixN/AFront Disc Brakes
1969PontiacGTON/AFront Disc Brakes
1969PontiacTempestN/AFront Disc Brakes
1968CadillacDeVilleN/Aw/Moraine Brakes; Front Disc Brakes
1968CadillacEldoradoN/Aw/Moraine Brakes; Front Disc Brakes
1968CadillacFleetwoodN/Aw/Moraine Brakes; Front Disc Brakes
1968ChevroletBel AirN/AFront Disc Brakes
1968ChevroletCamaroN/A
1968ChevroletCapriceN/AFront Disc Brakes
1968ChevroletCorvetteN/A
1968ChevroletImpalaN/AFront Disc Brakes
1968PontiacBonnevilleN/Aw/Moraine Brakes; Front Disc Brakes
1968PontiacCatalinaN/Aw/Moraine Brakes; Front Disc Brakes
1968PontiacFirebirdN/A
1968PontiacGrand PrixN/AFront Disc Brakes
1968PontiacGTON/AFront Disc Brakes
1968PontiacLeMansN/AFront Disc Brakes
1968PontiacTempestN/AFront Disc Brakes

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

5455516

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.