How to replace the brake master cylinder (Vacuum Boost) on GMC Sierra 3500?

You should first use the park brake and block the wheels when changing the Brake Master Cylinder (Vacuum Boost). Take off the plug from the Brake Fluid Level Sensor and remove the brake pipes attached to the master cylinder. Put a rubber cap or plug on the brake pipe fittings that are now open to keep brake fluid from leaking and contaminants out. Remove the nuts that hold the master cylinder in place and then lift out the master cylinder from the vehicle along with its reservoir. Put the master cylinder reservoir back in its place, and then perform a bench bleed on the master cylinder. Put the master cylinder into the vehicle and fasten it in place with the mounting nuts, turning them to 33 nm or 24 ft. Lbs. Take off the rubber cap or plug from the uncovered brake pipe openings, and then attach the brake pipes, tightening each fitting to 25 nm (18 ft. Lbs.). Carefully reconnect the electrical connector to the Brake Fluid Level Sensor, proceed to bleed the hydraulic brake system, and at last, release the park brake and take off any wheel blocks.

OEM GMC Sierra 3500 Brake Master Cylinder

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9 Brake Master Cylinders found

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GMC Sierra 3500 Overhaul Kit
Part Number: 19209251
$107.12 MSRP: $199.90
You Save: $92.78 (47%)
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Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Cylinder Kit, Brake Master Cylinder
- Replaces: 18048540, 18040237
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS
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GMC Sierra 3500 Overhaul Kit
Part Number: 19209252
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Cylinder Kit, Brake Master Cylinder
- Replaces: 18048541, 18040253
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS
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GMC Sierra 3500 Master Cylinder
Part Number: 19209250
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 18043278, 18048539, 18060790, 18040236
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS
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GMC Sierra 3500 Master Cylinder
Part Number: 19209249
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 18060789, 18048538, 18040252
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS
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GMC Sierra 3500 Master Cylinder
Part Number: 19209239
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 18047527
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS
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GMC Sierra 3500 Master Cylinder
Part Number: 19209234
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 18047512
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS
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GMC Sierra 3500 Master Cylinder
Part Number: 19209199
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 15269947, 18047540
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS
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GMC Sierra 3500 Master Cylinder
Part Number: 19209191
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 15183822
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS
View related parts
GMC Sierra 3500 Master Cylinder
Part Number: 18047524
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003 GMC Sierra 3500 | Base, SLE, SLT | 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS

GMC Sierra 3500 Brake Master Cylinder

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GMC Sierra 3500 Brake Master Cylinder Parts Questions & Experts Answers

Master Cylinder
19209239
Q: How to replace the brake master cylinder (Vacuum Boost) on GMC Sierra 3500?
A: You should first use the park brake and block the wheels when changing the Brake Master Cylinder (Vacuum Boost). Take off the plug from the Brake Fluid Level Sensor and remove the brake pipes attached to the master cylinder. Put a rubber cap or plug on the brake pipe fittings that are now open to keep brake fluid from leaking and contaminants out. Remove the nuts that hold the master cylinder in place and then lift out the master cylinder from the vehicle along with its reservoir. Put the master cylinder reservoir back in its place, and then perform a bench bleed on the master cylinder. Put the master cylinder into the vehicle and fasten it in place with the mounting nuts, turning them to 33 nm or 24 ft. Lbs. Take off the rubber cap or plug from the uncovered brake pipe openings, and then attach the brake pipes, tightening each fitting to 25 nm (18 ft. Lbs.). Carefully reconnect the electrical connector to the Brake Fluid Level Sensor, proceed to bleed the hydraulic brake system, and at last, release the park brake and take off any wheel blocks.

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