Brands Vehicles
Lowest Prices
Free Returns
Online Since 2009
JOIN GEARS TO SAVE 5%
Shop All Brands Shop All Vehicles

  2. Auto Parts
  3. Brake System
  4. Gaskets and Sealing Systems
  5. Brake Master Cylinder Cap Gasket
  6. Dorman 42103

Dorman 42103 Brake Master Cylinder Cap Gasket

Dorman 42103 Brake Master Cylinder Cap Gasket

Dorman
Brand:Dorman
Part Number: 42103
UPC: 00037495421034
Weight: 0.1 lbs
Condition:New



Availability:
0 in Stock
 OUT OF STOCK

Product Information

Description:

Get the Dorman 42103 Brake Master Cylinder Cap Gasket for your vehicle. Buy now and secure your purchase online!

This brake master cylinder reservoir cap gasket is designed to match the fit and function of the original gasket on specified vehicles, and is engineered for durability and reliable performance.

Features and Benefits:

  • Direct replacement - this brake master cylinder reservoir cap gasket is designed to match the fit and function of the original gasket on specified vehicles
  • Durable construction - this part is made from quality materials to ensure reliable performance and long service life
  • Restores functionality - this gasket is made to fit and fully restore part functionality after the original gasket fails
  • Trustworthy quality - backed by team of product experts in the United States and more than a century of automotive experience

Specifications:

Material:
Rubber
Package Contents:
1 Master Cylinder Gasket
General Motors #:
18011195
Wagner Brake #:
WCC-42103
Country of Origin:
CN

Select a vehicle to narrow Dorman 42103 Brake Master Cylinder Cap Gasket fitment info!

Last Updated: 04/16/2024

Years Vehicle Per Vehicle Fit NotesFitment Notes

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet Astro

4.3L V6 Gas OHV
1
 
Rear Reservoir
 

Chevrolet Astro



4.3L V6 Gas OHV Rear Reservoir

1 Per Vehicle

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet Astro

2.5L L4 Gas OHV
1
 
Rear Reservoir
 

Chevrolet Astro



2.5L L4 Gas OHV Rear Reservoir

1 Per Vehicle

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet G10

4.3L V6 Gas OHV,
5.0L V8 Gas OHV
1
 
Rear Reservoir
 

Chevrolet G10



4.3L V6 Gas OHV,
5.0L V8 Gas OHV Rear Reservoir

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet G10

5.7L V8 Gas OHV
1
 
Rear Reservoir
 

Chevrolet G10



5.7L V8 Gas OHV Rear Reservoir

1 Per Vehicle

1995

 

1994

 

1995

 

1994

 
Chevrolet G20

6.5L V8 Diesel OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G20



6.5L V8 Diesel OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet G20

4.3L V6 Gas OHV,
5.0L V8 Gas OHV,
5.7L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G20



4.3L V6 Gas OHV,
5.0L V8 Gas OHV,
5.7L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet G20

6.2L V8 Diesel OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G20



6.2L V8 Diesel OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1996

 

1995

 

1996

 

1995

 
Chevrolet G30

5.7L V8 CNG OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G30



5.7L V8 CNG OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1996

 

1995

 

1994

 

1996

 

1995

 

1994

 
Chevrolet G30

6.5L V8 Diesel OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G30



6.5L V8 Diesel OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1996

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1996

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 
Chevrolet G30

7.4L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G30



7.4L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1996

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1996

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet G30

4.3L V6 Gas OHV,
5.7L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G30



4.3L V6 Gas OHV,
5.7L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet G30

6.2L V8 Diesel OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G30



6.2L V8 Diesel OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1985

 

1985

 
Chevrolet G30

5.0L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

Chevrolet G30



5.0L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1989

 

1988

 

1987

 

1986

 

1985

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet P20

4.8L L6 Gas OHV,
5.7L V8 Gas OHV
1
 
Rear Reservoir
 

Chevrolet P20



4.8L L6 Gas OHV,
5.7L V8 Gas OHV Rear Reservoir

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1993

 

1992

 

1991

 

1990

 
Chevrolet P30

4.3L V6 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
Rear Drum
 

Chevrolet P30



4.3L V6 Gas OHV w/Vacuum Power Brakes
Rear Reservoir
Rear Drum

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet P30

5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
Rear Drum
 

Chevrolet P30



5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir
Rear Drum

1 Per Vehicle

1991

 

1990

 

1991

 

1990

 
Chevrolet P30

3.9L L4 Diesel OHV Turbo
1
 
w/Vacuum Power Brakes
Rear Reservoir
Rear Drum
 

Chevrolet P30



3.9L L4 Diesel OHV Turbo w/Vacuum Power Brakes
Rear Reservoir
Rear Drum

1 Per Vehicle

1989

 

1988

 

1987

 

1986

 

1985

 

1989

 

1988

 

1987

 

1986

 

1985

 
Chevrolet P30

4.8L L6 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
Rear Drum
 

Chevrolet P30



4.8L L6 Gas OHV w/Vacuum Power Brakes
Rear Reservoir
Rear Drum

1 Per Vehicle

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC G1500

4.3L V6 Gas OHV,
5.0L V8 Gas OHV
1
 
Rear Reservoir
 

GMC G1500



4.3L V6 Gas OHV,
5.0L V8 Gas OHV Rear Reservoir

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC G1500

5.7L V8 Gas OHV
1
 
Rear Reservoir
 

GMC G1500



5.7L V8 Gas OHV Rear Reservoir

1 Per Vehicle

1995

 

1994

 

1995

 

1994

 
GMC G2500

6.5L V8 Diesel OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

GMC G2500



6.5L V8 Diesel OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC G2500

4.3L V6 Gas OHV,
5.0L V8 Gas OHV,
5.7L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

GMC G2500



4.3L V6 Gas OHV,
5.0L V8 Gas OHV,
5.7L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC G2500

6.2L V8 Diesel OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

GMC G2500



6.2L V8 Diesel OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1996

 

1995

 

1996

 

1995

 
GMC G3500

5.7L V8 CNG OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

GMC G3500



5.7L V8 CNG OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1996

 

1995

 

1994

 

1996

 

1995

 

1994

 
GMC G3500

6.5L V8 Diesel OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

GMC G3500



6.5L V8 Diesel OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1996

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1996

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 
GMC G3500

7.4L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

GMC G3500



7.4L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1996

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1996

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC G3500

4.3L V6 Gas OHV,
5.7L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

GMC G3500



4.3L V6 Gas OHV,
5.7L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC G3500

6.2L V8 Diesel OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
 

GMC G3500



6.2L V8 Diesel OHV w/Vacuum Power Brakes
Rear Reservoir

1 Per Vehicle

1989

 

1989

 
GMC P2500

4.8L L6 Gas OHV
1
 
Rear Reservoir
 

GMC P2500



4.8L L6 Gas OHV Rear Reservoir

1 Per Vehicle

1989

 

1988

 

1987

 

1986

 

1985

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC P2500

5.7L V8 Gas OHV
1
 
Rear Reservoir
 

GMC P2500



5.7L V8 Gas OHV Rear Reservoir

1 Per Vehicle

1987

 

1986

 

1985

 

1987

 

1986

 

1985

 
GMC P2500

4.8L L6 Gas OHV
1
 
Rear Reservoir
 

GMC P2500



4.8L L6 Gas OHV Rear Reservoir

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1993

 

1992

 

1991

 

1990

 
GMC P3500

4.3L V6 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
Rear Drum
 

GMC P3500



4.3L V6 Gas OHV w/Vacuum Power Brakes
Rear Reservoir
Rear Drum

1 Per Vehicle

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC P3500

5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
Rear Drum
 

GMC P3500



5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV w/Vacuum Power Brakes
Rear Reservoir
Rear Drum

1 Per Vehicle

1991

 

1990

 

1991

 

1990

 
GMC P3500

3.9L L4 Diesel OHV Turbo
1
 
w/Vacuum Power Brakes
Rear Reservoir
Rear Drum
 

GMC P3500



3.9L L4 Diesel OHV Turbo w/Vacuum Power Brakes
Rear Reservoir
Rear Drum

1 Per Vehicle

1989

 

1988

 

1987

 

1986

 

1985

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC P3500

4.8L L6 Gas OHV
1
 
w/Vacuum Power Brakes
Rear Reservoir
Rear Drum
 

GMC P3500



4.8L L6 Gas OHV w/Vacuum Power Brakes
Rear Reservoir
Rear Drum

1 Per Vehicle

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1995

 

1994

 

1993

 

1992

 

1991

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC Safari

4.3L V6 Gas OHV
1
 
Rear Reservoir
 

GMC Safari



4.3L V6 Gas OHV Rear Reservoir

1 Per Vehicle

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 

1990

 

1989

 

1988

 

1987

 

1986

 

1985

 
GMC Safari

2.5L L4 Gas OHV
1
 
Rear Reservoir
 

GMC Safari



2.5L L4 Gas OHV Rear Reservoir

1 Per Vehicle