How to remove the brake master cylinder on GMC Safari?

To remove the brake master cylinder, start by placing rags under the brake line fittings and preparing caps or plastic bags to cover the ends of the lines once they are disconnected. Then, use a flare-nut wrench to loosen the tube nuts at the ends of the brake lines where they enter the brake master cylinder. Pull the brake lines away slightly and plug the ends to prevent contamination. Remove the mounting nuts and disconnect the pushrod from the brake pedal. Move the bracket retaining the combination valve forward slightly and remove the brake master cylinder from the vehicle. Remove the reservoir covers and diaphragms, and discard any remaining fluid. Mount the brake master cylinder in a vise with blocks of wood to prevent damage. Remove the primary piston lock-ring and assembly, followed by the secondary piston assembly. Pry the reservoir from the cylinder body and remove the grommets. Do not attempt to remove the quick take-up valve. To overhaul the brake master cylinder, inspect the cylinder bore for corrosion and damage. If any is found, replace the brake master cylinder body. Lubricate and press the new reservoir grommets into the body, then press the brake master cylinder body onto the reservoir. Remove the old seals from the secondary piston assembly and install the new seals with the lips facing away from each other. Attach the spring retainer and lubricate the cylinder bore. Install the spring and secondary piston assembly, followed by the primary piston assembly and lock-ring. Inspect the reservoir cover and diaphragm, replacing any damaged parts. Insert threaded plugs into the cylinder outlet holes and fill the reservoirs with brake fluid. Loosen one plug at a time and push the piston assembly into the bore to force air out. Stroke the piston multiple times for each outlet to ensure all air is expelled. Refill the reservoirs and install the diaphragm and cover assembly. To install the brake master cylinder, reverse the removal steps and bleed the brakes.

Genuine GMC Safari Brake Master Cylinder

Select Vehicle by Model
Select Vehicle by VIN

Select Vehicle by Model

Make

Model

Year

Select Vehicle by VIN

For the most accurate results, select vehicle by your VIN (Vehicle Identification Number).

9 Brake Master Cylinders found

View related parts
GMC Safari Brake Master Cylinder Assembly
Part Number: 18029963
$174.40 MSRP: $321.80
You Save: $147.40 (46%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: CYLINDER, Brake Master Cylinder; Master Cylinder
- Replaces: 18015414
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1990-1995 GMC Safari | VAN SAFARI | 4 Cyl 2.5L, 6 Cyl 4.3L
View related parts
GMC Safari Brake Master Cylinder Kit
Part Number: 18012918
Product Specifications
- Other Name: REPAIR KIT, Brake Master Cylinder; Master Cylinder Repair Kit, Overhaul Kit
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1989 GMC Safari | VAN SAFARI | 4 Cyl 2.5L, 6 Cyl 4.3L
View related parts
GMC Safari Brake Master Cylinder Assembly
Part Number: 18029964
Product Specifications
- Other Name: CYLINDER, Brake Master Cylinder; Master Cylinder
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1990-1994 GMC Safari | VAN SAFARI | 4 Cyl 2.5L, 6 Cyl 4.3L
View related parts
GMC Safari CYLINDER KIT
Part Number: 18047531
Product Specifications
- Other Name: CYLINDER KIT, Brake Master; Overhaul Kit
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2005 GMC Safari | VAN SAFARI | 6 Cyl 4.3L
View related parts
GMC Safari Brake Master Cylinder Assembly
Part Number: 18047594
Product Specifications
- Other Name: CYLINDER, Brake Master Cylinder; Master Cylinder
- Replaces: 18029952
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 GMC Safari | VAN SAFARI | 6 Cyl 4.3L
View related parts
GMC Safari Cylinder Kit,Brake Master Cylinder Repair
Part Number: 18023274
Product Specifications
- Other Name: CYLINDER KIT, Brake Master; Overhaul Kit
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 GMC Safari | VAN SAFARI | 6 Cyl 4.3L
View related parts
GMC Safari Brake Master Cylinder Assembly
Part Number: 19209241
Product Specifications
- Other Name: CYLINDER
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003 GMC Safari | VAN SAFARI | 6 Cyl 4.3L
View related parts
GMC Safari Brake Master Cylinder Assembly
Part Number: 19209257
Product Specifications
- Other Name: CYLINDER, Brake Master Cylinder; Master Cylinder
- Replaces: 18048897
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2005 GMC Safari | VAN SAFARI | 6 Cyl 4.3L
View related parts
GMC Safari Master Cyl. Asm. Pkg.
Part Number: 18013440
Product Specifications
- Other Name: CYLINDER, Brake Master Cylinder; Master Cylinder
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1989 GMC Safari | VAN SAFARI | 4 Cyl 2.5L, 6 Cyl 4.3L

GMC Safari Brake Master Cylinder

The Brake Master Cylinder of a GMC Safari is responsible for converting every push of the brake pedal into precise hydraulic pressure, which makes the van stop. The Brake Master Cylinder is generally mounted to the vacuum booster's front by bolts and housed within a cast iron or aluminum casing. The master cylinder has a polished bore that houses two pistons to feed two separate and independent circuits. As such, if one circuit fails, the other allows the vehicle to be slowed to a stop. The early units have a built-in metal reservoir with a wire bail cap, while later styles have an external plastic reservoir sealed with O-rings and threaded caps. This change allowed for easy fluid checks and reduced contamination. The design of this Brake Master Cylinder is such that strong return springs snap the pistons rearward when your foot lifts. In addition, small ports and flexible cup seals keep fresh fluid ready for your next stop. Numerous GMC Safari proprietors discover that the bore rust caused by moisture or aging seals allows fluid to bypass or leak. This leads to a low pedal and longer stops. These indicate Brake Master Cylinder trouble. Every GMC Safari on the road today relies on a proven Brake Master Cylinder to deliver consistent pedal feel, equal braking, and everyday confidence.

Each OEM GMC Safari Brake Master Cylinder we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.

GMC Safari Brake Master Cylinder Parts Questions & Experts Answers

Brake Master Cylinder Assembly
18029963
Q: How to remove the brake master cylinder on GMC Safari?
A:
To remove the brake master cylinder, start by placing rags under the Brake Line fittings and preparing caps or plastic bags to cover the ends of the lines once they are disconnected. Then, use a flare-nut wrench to loosen the tube nuts at the ends of the brake lines where they enter the brake master cylinder. Pull the brake lines away slightly and plug the ends to prevent contamination. Remove the mounting nuts and disconnect the pushrod from the brake pedal. Move the bracket retaining the combination valve forward slightly and remove the brake master cylinder from the vehicle. Remove the reservoir covers and diaphragms, and discard any remaining fluid. Mount the brake master cylinder in a vise with blocks of wood to prevent damage. Remove the primary piston lock-ring and assembly, followed by the secondary piston assembly. Pry the reservoir from the cylinder body and remove the grommets. Do not attempt to remove the quick take-up valve. To overhaul the brake master cylinder, inspect the cylinder bore for corrosion and damage. If any is found, replace the brake master cylinder body. Lubricate and press the new reservoir grommets into the body, then press the brake master cylinder body onto the reservoir. Remove the old seals from the secondary piston assembly and install the new seals with the lips facing away from each other. Attach the spring retainer and lubricate the cylinder bore. Install the spring and secondary piston assembly, followed by the primary piston assembly and lock-ring. Inspect the reservoir cover and diaphragm, replacing any damaged parts. Insert threaded plugs into the cylinder outlet holes and fill the reservoirs with brake fluid. Loosen one plug at a time and push the piston assembly into the bore to force air out. Stroke the piston multiple times for each outlet to ensure all air is expelled. Refill the reservoirs and install the diaphragm and cover assembly. To install the brake master cylinder, reverse the removal steps and bleed the brakes.