ACDelco 18M1878 | Brake Master Cylinder

Part Number

18M1878

Brake Master Cylinder

Fits: American Motors Matador, Buick Apollo, Buick Centurion, Buick Century, Buick Electra, Buick Estate Wagon, Buick GS, Buick GS 455, Buick LeSabre, Buick Regal, Buick Riviera, Buick Skyhawk, Buick Skylark, Buick Sportwagon, Cadillac Calais, Cadillac Commercial Chassis, Cadillac DeVille, Cadillac Eldorado, Cadillac Fleetwood, Cadillac Seville, Checker Marathon, Chevrolet Bel Air, Chevrolet Biscayne, Chevrolet Blazer, Chevrolet Brookwood, Chevrolet C10, Chevrolet C10 Suburban, Chevrolet Camaro, Chevrolet Caprice, Chevrolet El Camino, Chevrolet G10, Chevrolet G20 Van, Chevrolet Impala, Chevrolet K10, Chevrolet K10 Pickup, Chevrolet K10 Suburban, Chevrolet K5 Blazer, Chevrolet Kingswood, Chevrolet Laguna, Chevrolet Malibu, Chevrolet Monte Carlo, Chevrolet Nova, Chevrolet Townsman, GMC C15, GMC C15 Suburban, GMC C15/C1500 Suburban, GMC C1500, GMC C1500 Suburban, GMC G15, GMC G1500, GMC G25/G2500 Van, GMC Jimmy

Special Price $55.11 Regular Price $64.83

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In stock

Estimated Ship Date: 1 Business Day or Less

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Details

ACDelco Professional Brake Master Cylinders use both aluminum and iron castings, making them a high quality replacement for many vehicles on the road today. These master cylinders contain both Ethylene Propylene (EPDM) and Styrene Butadiene (SBR) rubber components to provide superior resistance to heat, corrosion, and leakage. ACDelco Professional Brake Master Cylinders are ready to bench bleed and install right out of the box - no assembly required. These premium aftermarket replacement brake master cylinders are manufactured to meet your expectations for fit, form, and function. ? WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov

BRAND: ACDelco

FEATURES:

American Motors;Buick;Cadillac;Checker;Chevrolet;GMC;Jeep;Oldsmobile;Pontiac
Cast iron and aluminum specifications; no extra stress on the brake boosting mounting
Geometrical tolerance ensures that the body and plastic reservoir match for a proper fit
Meets the brake performance requirements of SAE J1153 and J1154 testing, providing reliability and quality
Piston assembly and return spring help to prevent brake drag, which can cause premature brake pad wear
Pressure tested to ensure safe and confident braking

SPECIFICS:

Bleeder Hoses Included	Yes
Brake Booster Included	No
FAQ - Answer 1	No, but it is a good idea to inspect them for wear-out, cracking, leaking etc.
FAQ - Answer 2	Yes, ACDelco also offers GM OE brake cylinders.
FAQ - Answer 3	Yes, ACDelco Professional Brake Cylinders come with a 12 month / unlimited mile warranty.
FAQ - Question 1	Do I have to replace all my brake parts when replacing my brake cylinder?
FAQ - Question 2	Does ACDelco offer other grades of brake cylinders?
FAQ - Question 3	Are these brake parts durable?
Good Maintenance Practices - Section 1 - Bullet 1	Check brake fluid level at every oil change. Replace fluid according to owner's manual recommendations.
Good Maintenance Practices - Section 1 - Bullet 2	Calipers and wheel cylinders should be checked every brake inspection and serviced or replaced as required.
Good Maintenance Practices - Section 1 - Bullet 3	Inspect the brake lines for rust, punctures, or visible leaks (You may be able to do this, but consult a qualified technician if necessary).
Good Maintenance Practices - Section 1 - Bullet 4	Check the thickness of your brake pads.
Good Maintenance Practices - Section 1 - Header	The following inspections and maintenance procedures can help prevent potential brake problems:
Good Maintenance Practices - Section 2 - Bullet 1	Inspection of the brake hoses for brittleness or cracking.
Good Maintenance Practices - Section 2 - Bullet 2	Inspection of brake lining and pads for wear or contamination by brake fluid or grease.
Good Maintenance Practices - Section 2 - Bullet 3	Inspection of wheel bearings and grease seals.
Good Maintenance Practices - Section 2 - Bullet 4	Parking brake adjustments (as needed).
Good Maintenance Practices - Section 2 - Header	The following should be conducted by a qualified technician:
Height (in)	4.8
Length (in)	9.4
Master Cylinder Cap Included	Yes
Master Cylinder Material	Cast-Iron
Mounting Bracket Included	No
Mounting Hole Quantity	2
Port Quantity	2
Programming Required	No
Pushrod Included	No
Reservoir Included	Yes
Signs of Wear & Troubleshooting - Section 1 - Bullet 1	Brake warning light is on.
Signs of Wear & Troubleshooting - Section 1 - Bullet 2	Fluid spots beneath the car, indicating there may be a leak within the cylinder.
Signs of Wear & Troubleshooting - Section 1 - Bullet 3	Difficulty stopping the vehicle.
Signs of Wear & Troubleshooting - Section 1 - Bullet 4	A low or sinking brake pedal.
Signs of Wear & Troubleshooting - Section 1 - Header	Brake cylinder signs of wear include:
Weight (lb)	1.4
Width (in)	5.8

DOWNLOADS:

APPLICATIONS:

1975-1975 Chevrolet G10 - Position: N/A
1975-1977 Pontiac Grand LeMans - Position: N/A
1971-1972 Pontiac Parisienne - Position: N/A

Rectangular Reservoir

1976-1976 Cadillac Fleetwood - Position: N/A

Commercial Chassis

1977-1978 Chevrolet G10 - Position: N/A
1971-1972 Buick Centurion - Position: N/A

Rectangular Reservoir

1975-1975 GMC G15 - Position: N/A
1975-1977 Chevrolet Malibu - Position: N/A
1971-1972 Chevrolet Impala - Position: N/A

Rectangular Reservoir

1973-1975 Chevrolet K10 Suburban - Position: N/A

Except BENDIX Master Cylinder

1971-1972 Pontiac Grandville - Position: N/A

Rectangular Reservoir

1979-1980 Chevrolet K5 Blazer - Position: N/A
1975-1979 Buick Skylark - Position: N/A
1975-1977 Oldsmobile Cutlass Salon - Position: N/A
1973-1980 Chevrolet Caprice - Position: N/A
1979-1980 Chevrolet C10 Suburban - Position: N/A
1973-1973 Pontiac GTO - Position: N/A
1977-1980 Cadillac Fleetwood - Position: N/A
1971-1975 Cadillac Calais - Position: N/A
1975-1977 GMC Sprint - Position: N/A
1973-1977 Buick Century - Position: N/A
1974-1980 Jeep Cherokee - Position: N/A
1975-1979 Oldsmobile Omega - Position: N/A
1973-1980 Chevrolet Impala - Position: N/A
1973-1977 Buick Regal - Position: N/A
1973-1980 Buick Estate Wagon - Position: N/A
1971-1972 Buick LeSabre - Position: N/A

Rectangular Reservoir

1971-1972 Pontiac Grand Prix - Position: N/A

Except MORAINE Master Cylinder

1976-1980 Pontiac Parisienne - Position: N/A
1971-1972 Pontiac Bonneville - Position: N/A

Rectangular Reservoir

1979-1980 GMC Jimmy - Position: N/A
1973-1974 Chevrolet K10 Pickup - Position: N/A
1972-1972 Buick Sportwagon - Position: N/A

Except MORAINE Master Cylinder

1973-1977 GMC Jimmy - Position: N/A
1973-1980 Oldsmobile Custom Cruiser - Position: N/A
1971-1972 Chevrolet Caprice - Position: N/A

Rectangular Reservoir

1973-1980 Oldsmobile 98 - Position: N/A
1973-1975 Chevrolet Bel Air - Position: N/A
1971-1972 Pontiac Grand Safari - Position: N/A

Rectangular Reservoir

1976-1978 Chevrolet K10 Suburban - Position: N/A

Reservoir Cap Is Rectangular

1975-1980 Jeep J20 - Position: N/A
1976-1976 Pontiac Grand Prix - Position: N/A

Except MORAINE Master Cylinder

1973-1975 Chevrolet C10 Suburban - Position: N/A

Except MORAINE Master Cylinder

1975-1977 Oldsmobile Cutlass Supreme - Position: N/A
1977-1980 Pontiac Firebird - Position: N/A
1973-1980 Buick Electra - Position: N/A
1971-1972 Buick Estate Wagon - Position: N/A

Rectangular Reservoir

1973-1973 Oldsmobile Toronado - Position: N/A
1971-1972 Oldsmobile 98 - Position: N/A

Rectangular Reservoir

1979-1980 Chevrolet G10 - Position: N/A

w/ 11" X 2" Brakes

1979-1980 GMC K1500 - Position: N/A
1972-1972 Buick GS - Position: N/A

Except MORAINE Master Cylinder

1977-1980 Cadillac DeVille - Position: N/A
1973-1980 Oldsmobile Delta 88 - Position: N/A
1979-1980 GMC C1500 Suburban - Position: N/A
1970-1971 Buick Skylark - Position: N/A
1973-1978 Pontiac Grand Safari - Position: N/A
1975-1975 Buick Skyhawk - Position: N/A

Bore 1-1/8in

1975-1977 Oldsmobile Cutlass - Position: N/A
1972-1972 Buick GS 455 - Position: N/A

Except MORAINE Master Cylinder

1975-1977 Pontiac LeMans - Position: N/A
1971-1980 Cadillac Commercial Chassis - Position: N/A
1979-1980 GMC C1500 - Position: N/A
1974-1974 Pontiac Laurentian - Position: N/A
1970-1970 Pontiac Tempest - Position: N/A
1973-1980 Buick LeSabre - Position: N/A
1977-1979 Pontiac Phoenix - Position: N/A
1971-1972 Oldsmobile Delta 88 - Position: N/A

Rectangular Reservoir

1975-1980 Chevrolet K10 - Position: N/A
1974-1980 Jeep J10 - Position: N/A
1973-1974 GMC K15/K1500 Pickup - Position: N/A
1975-1978 GMC K15 - Position: N/A
1976-1976 Chevrolet G10 - Position: N/A

Except BENDIX Master Cylinder

1973-1975 Pontiac Grandville - Position: N/A
1977-1977 Pontiac Grand Prix - Position: N/A
1973-1974 GMC C15/C1500 Suburban - Position: N/A

Except MORAINE Master Cylinder

1973-1974 GMC K15/K1500 Suburban - Position: N/A

Except BENDIX Master Cylinder

1973-1978 Buick Riviera - Position: N/A
1977-1978 GMC G15 - Position: N/A
1976-1976 Oldsmobile Cutlass Tiara - Position: N/A
1973-1973 GMC G25/G2500 Van - Position: N/A

with 2 Bails Except MORAINE Master Cylinder

1975-1976 Pontiac Firebird - Position: N/A

Except MORAINE Master Cylinder

1975-1976 Chevrolet Laguna - Position: N/A
1973-1974 Chevrolet Blazer - Position: N/A
1978-1978 GMC Jimmy - Position: N/A

Except MORAINE Master Cylinder

1979-1980 Chevrolet C10 - Position: N/A
1973-1973 Chevrolet G20 Van - Position: N/A

with 2 Bails Except MORAINE Master Cylinder

1975-1975 Pontiac Grand Am - Position: N/A
1971-1972 Chevrolet Brookwood - Position: N/A

Rectangular Reservoir

1975-1976 GMC C15 - Position: N/A
1975-1977 Chevrolet K5 Blazer - Position: N/A
1975-1976 Chevrolet El Camino - Position: N/A
1979-1980 GMC G1500 - Position: N/A

w/ 11" X 2" Brakes

1971-1975 Cadillac Eldorado - Position: N/A
1971-1972 Chevrolet Biscayne - Position: N/A

Rectangular Reservoir

1977-1978 GMC C15 - Position: N/A

Except BENDIX Master Cylinder

1973-1973 Buick Centurion - Position: N/A
1976-1976 American Motors Matador - Position: N/A

with Rectangular Master Cylinder Cover

1975-1975 Buick Apollo - Position: N/A
1973-1975 Pontiac Grand Prix - Position: N/A
1971-1972 Oldsmobile Custom Cruiser - Position: N/A

Rectangular Reservoir

1975-1975 GMC C15 Suburban - Position: N/A

Except MORAINE Master Cylinder

1967-1979 Checker Marathon - Position: N/A
1977-1977 Chevrolet El Camino - Position: N/A

Except MORAINE Master Cylinder

1976-1978 GMC K15 Suburban - Position: N/A

Reservoir Cap Is Rectangular

1976-1976 GMC G15 - Position: N/A

Except BENDIX Master Cylinder

1970-1971 Buick Sportwagon - Position: N/A
1969-1971 Oldsmobile 442 - Position: N/A
1973-1975 Oldsmobile Vista Cruiser - Position: N/A
1975-1979 Chevrolet Nova - Position: N/A
1976-1976 Cadillac Seville - Position: N/A
1976-1978 Oldsmobile Toronado - Position: N/A
1970-1970 Chevrolet Camaro - Position: N/A
1977-1978 Chevrolet C10 - Position: N/A

Except BENDIX Master Cylinder

1970-1971 Buick GS - Position: N/A
1970-1971 Buick GS 455 - Position: N/A
1971-1975 Cadillac DeVille - Position: N/A
1971-1977 Chevrolet Monte Carlo - Position: N/A
1973-1974 Pontiac Parisienne - Position: N/A
1975-1976 Chevrolet C10 - Position: N/A
1971-1972 Buick Electra - Position: N/A

Rectangular Reservoir

1976-1980 Pontiac Laurentian - Position: N/A
1978-1978 Chevrolet K5 Blazer - Position: N/A

Except MORAINE Master Cylinder

1973-1980 Pontiac Catalina - Position: N/A
1971-1972 Pontiac Catalina - Position: N/A

Rectangular Reservoir

1971-1972 Buick Riviera - Position: N/A

Rectangular Reservoir

1977-1978 American Motors Matador - Position: N/A

Vehicles Built For United States Market

1971-1972 Chevrolet Townsman - Position: N/A

Rectangular Reservoir

1972-1972 Buick Skylark - Position: N/A

Except MORAINE Master Cylinder

1976-1978 Chevrolet C10 Suburban - Position: N/A

Reservoir Cap Is Rectangular

1971-1975 Cadillac Fleetwood - Position: N/A
1975-1975 GMC K15 Suburban - Position: N/A

Except BENDIX Master Cylinder

1971-1972 Chevrolet Bel Air - Position: N/A

Rectangular Reservoir

1976-1978 GMC C15 Suburban - Position: N/A

Reservoir Cap Is Rectangular

1973-1980 Pontiac Bonneville - Position: N/A
1975-1980 Chevrolet Camaro - Position: N/A
1975-1977 Pontiac Ventura - Position: N/A
1975-1980 Jeep Wagoneer - Position: N/A
1971-1972 Chevrolet Kingswood - Position: N/A

Rectangular Reservoir

Product Questions (4)

Customer Questions

Does AC Delco make Ford parts?

No, AC Delco produces parts primarily for General Motors vehicles and does not make parts specifically for Ford vehicles.

Can I use AC Delco parts to replace OEM parts?

Yes, in most cases AC Delco parts can be used as a replacement for OEM parts. However, it's important to ensure that the parts are compatible with your specific make and model of vehicle.

What AC Delco oil filter do I need?

AC Delco offers a variety of oil filters that are compatible with different makes and models of vehicles. To determine which AC Delco oil filter you need, consult your vehicle's owner's manual or use our online filter lookup tool that matches the make, model, and year of your vehicle.

What is a brake master cylinder?

The brake master cylinder converts brake pedal pressure into hydraulic pressure to activate the brakes.