How to replace the brake master cylinder (Vacuum Boost) on GMC Sierra 1500?

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.

How to service and repair the Brake Master Cylinder on GMC Sierra 1500?

Apply the Brake Master Cylinder to work with a bench vise while providing access to service the primary Piston. Install fittings into the master cylinder ports that fit its required connections for brake fluid hose attachments. Set up transparent hoses to the newly installed fittings that plug into the master cylinder tank. Put delco supreme 11 or equivalent dot-3 brake fluid from an unopened container into the reservoir until it covers at least half of the space for both brake hoses to reach fluid and remain submerged. Use a round-ended tool to press and release the primary Piston of the master cylinder to 25mm depth about five times. Check the fluid flow from the ports as Piston air evacuation makes Piston depression harder and reduces its travel distance. Move back and forth with the tool until clean fluid emerges freely through the ports without trapped air. After bleeding reverse the procedure by replacing master cylinder parts and freeing the hose fittings from ports before lifting the master cylinder and its cloth from the vise.

OEM GMC Sierra 1500 Brake Master Cylinder

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18 Brake Master Cylinders found

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GMC Sierra 1500 Master Cylinder Part Number: 20925765
$78.63 MSRP: $147.66
You Save: $69.03 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaced by: 84822232
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2019 GMC Sierra 1500 | AT4, Base, Denali, Elevation, SLE, SLT | 6 Cyl 4.3 L FLEX, 6 Cyl 4.3 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Master Cylinder Part Number: 19420798
$153.44 MSRP: $297.80
You Save: $144.36 (49%)
ADD TO CART
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaced by: 19432757
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2013 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT, XFE | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.0 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L FLEX
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GMC Sierra 1500 Master Cylinder Part Number: 87815018
$908.75 MSRP: $1442.81
You Save: $534.06 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Master Cylinder Assembly
- Replaced by: 85697531
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2022-2023 GMC Sierra 1500 | AT4, AT4X, Denali, Denali Ultimate, Elevation, Pro, SLE, SLT | 4 Cyl 2.7 L GAS, 6 Cyl 3.0 L DIESEL, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Brake Master Cylinder Part Number: 86788482
$987.28 MSRP: $1680.82
You Save: $693.54 (42%)
ADD TO CART
Product Specifications
- Other Name: CYLINDER ASM-BRK MAS(W/P/B BOOS&ELEK BRK), Master Cylinder, Master Cylinder Assembly; Master Cylinder Assembly
- Replaced by: 85077522
- Replaces: 84514095, 84514094, 84933511, 84821586, 85124356, 84702004, 84821585, 84933510, 84702005
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2022 GMC Sierra 1500 | AT4, AT4X, Base, Denali, Denali Ultimate, Elevation, Pro, SLE, SLT | 4 Cyl 2.7 L GAS, 6 Cyl 3.0 L DIESEL, 6 Cyl 4.3 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Master Cylinder Part Number: 19432946
$169.94 MSRP: $307.58
You Save: $137.64 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder
- Replaced by: 19432748
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2009 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L FLEX, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Master Cylinder Part Number: 19432944
$149.83 MSRP: $281.38
You Save: $131.55 (47%)
ADD TO CART
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder
- Replaced by: 19432746
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2008 GMC Sierra 1500 | Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Master Cylinder Part Number: 22936000
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 15775174, 20759706
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2013 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT, XFE | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.0 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L FLEX
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GMC Sierra 1500 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:
- 1999-2002 GMC Sierra 1500 | Base, C3, Denali, HT, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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GMC Sierra 1500 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:
- 1999-2002 GMC Sierra 1500 | Base, C3, Denali, HT, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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GMC Sierra 1500 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:
- 1999-2002 GMC Sierra 1500 | Base, C3, Denali, HT, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 1500 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:
- 2003-2007 GMC Sierra 1500 | Base, Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
View related parts
GMC Sierra 1500 Master Cylinder Part Number: 19209236
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 18047519
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2006 GMC Sierra 1500 | Hybrid | 8 Cyl 5.3 L FULL HYBRID EV-GAS (FHEV)
View related parts
GMC Sierra 1500 Overhaul Kit Part Number: 19209251
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:
- 1999-2002 GMC Sierra 1500 | Base, C3, Denali, HT, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 1500 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:
- 2003-2007 GMC Sierra 1500 | Base, Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
View related parts
GMC Sierra 1500 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 1500 | Base, Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 1500 Master Cylinder Part Number: 19209192
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 15183823
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007 GMC Sierra 1500 | Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
View related parts
GMC Sierra 1500 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:
- 2005-2007 GMC Sierra 1500 | Base, Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
View related parts
GMC Sierra 1500 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 1500 | Base, Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS

GMC Sierra 1500 Brake Master Cylinder

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GMC Sierra 1500 Brake Master Cylinder Parts and Q&A

Master Cylinder
19209239
Q: How to replace the brake master cylinder (Vacuum Boost) on GMC Sierra 1500?
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.
Master Cylinder
19209236
Q: How to service and repair the Brake Master Cylinder on GMC Sierra 1500?
A:
Apply the Brake Master Cylinder to work with a bench vise while providing access to service the primary Piston. Install fittings into the master cylinder ports that fit its required connections for brake fluid hose attachments. Set up transparent hoses to the newly installed fittings that plug into the master cylinder tank. Put delco supreme 11 or equivalent dot-3 brake fluid from an unopened container into the reservoir until it covers at least half of the space for both brake hoses to reach fluid and remain submerged. Use a round-ended tool to press and release the primary Piston of the master cylinder to 25mm depth about five times. Check the fluid flow from the ports as Piston air evacuation makes Piston depression harder and reduces its travel distance. Move back and forth with the tool until clean fluid emerges freely through the ports without trapped air. After bleeding reverse the procedure by replacing master cylinder parts and freeing the hose fittings from ports before lifting the master cylinder and its cloth from the vise.