How to service and repair the Brake Master Cylinder on Chevrolet Astro?

When fixing the Brake Master Cylinder start by clamping its mounting flange in a workshop vise so you can reach the rear of the main Piston. Set up suitable brake fittings to the master cylinder ports for hose attachment following flare seat specifications. Install transparent hoses to these fittings and lead them to the master cylinder reservoir. Put delco supreme 11(R) brake fluid gm p/n 12377967 or its dot-3 brand equivalent into the reservoir through one end of the transparent hose lines until the fluid reaches half the container while keeping both hose tips fully under liquid. Use a rounded-end tool to control the primary Piston up and down multiple times; look at the fluid flowing from the ports. At the same time the primary Piston becomes harder to press and moves less with each bleed cycle. Repeat this step until clear fluid comes out smoothly from both ports without air present. When complete remove the transparent hoses from the reservoir then replace the master cylinder parts before disconnecting the hoses from their ports and putting down the master cylinder with a shop cloth to prepare for removal.

OEM Chevrolet Astro Brake Master Cylinder

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10 Brake Master Cylinders found

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Chevrolet Astro Master Cylinder Part Number: 18029963
$173.93 MSRP: $321.80
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Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 18015414
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995, 1990 Chevrolet Astro | Base, CL, CS, LT | 4 Cyl 2.5 L GAS, 6 Cyl 4.3 L GAS
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Chevrolet Astro Master Cylinder Part Number: 18047529
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 Chevrolet Astro | Base, LS, LT | 6 Cyl 4.3 L GAS
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Chevrolet Astro Overhaul Kit Part Number: 18011029
Product Specifications
- Other Name: Cylinder Kit, Brake Master; Repair Kit, Brake Master Cylinder
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995, 1990 Chevrolet Astro | Base, CL, CS, LT | 4 Cyl 2.5 L GAS, 6 Cyl 4.3 L GAS
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Chevrolet Astro Master Cylinder Part Number: 19209257
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 18048897
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2005 Chevrolet Astro | Base, LS, LT | 6 Cyl 4.3 L GAS
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Chevrolet Astro Master Cylinder Part Number: 18047594
Product Specifications
- Other Name: Cylinder, Brake Master Cylinder; Brake Master Cylinder
- Replaces: 18029952
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Astro | Base, LS, LT | 6 Cyl 4.3 L GAS
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Chevrolet Astro Overhaul Kit Part Number: 18047531
Product Specifications
- Other Name: Cylinder Kit; Cylinder Kit, Brake Master Cylinder
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2005 Chevrolet Astro | Base, LS, LT | 6 Cyl 4.3 L GAS
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Chevrolet Astro Master Cylinder Part Number: 18029964
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:
- 1990-1994 Chevrolet Astro | Base, CL, CS, LT | 4 Cyl 2.5 L GAS, 6 Cyl 4.3 L GAS
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Chevrolet Astro Overhaul Kit Part Number: 18023274
Product Specifications
- Other Name: Cylinder Kit, Brake Master Cylinder
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Astro | Base, LS, LT | 6 Cyl 4.3 L GAS
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Chevrolet Astro Master Cylinder Part Number: 18013440
Product Specifications
- Other Name: Master Cylinder Assembly Package; Brake Master Cylinder; Cylinder, Brake Master Cylinder
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1989 Chevrolet Astro | Base, CL, CS, LT | 4 Cyl 2.5 L GAS, 6 Cyl 4.3 L GAS
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Chevrolet Astro Overhaul Kit Part Number: 18012918
Product Specifications
- Other Name: Cylinder Kit, Brake Master; Master Cylinder Repair Kit; Cylinder Kit, Brake Master Cylinder; Repair Kit, Brake Master Cylinder
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1994 Chevrolet Astro | Base, CL, CS, LT | 4 Cyl 2.5 L GAS, 6 Cyl 4.3 L GAS

Chevrolet Astro Brake Master Cylinder

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The Brake Master Cylinder used in Chevrolet Astro is a hydraulic assembly which is essential for the braking system and is used to transform the pressure exerted by the driver's foot into hydraulic pressure. This hydraulic pressure is then transferred to the slave cylinders which in turn release the brakes, so as to slow down or stop the vehicle. The master cylinder is composed of the pistons, seals, springs, and may have a cast iron or aluminium casing, fluid reservoirs can be either built in or can be separate depending on the year of manufacture. The Chevrolet Astro cars have dual circuit brake master cylinders to provide braking power in the event of a failure of one circuit. This design is safer than the previous one because it can continue to operate in the case of hydraulic failure.

Chevrolet Astro Brake Master Cylinder Parts Questions & Experts Answers

Master Cylinder
18047594
Q: How to service and repair the Brake Master Cylinder on Chevrolet Astro?
A:
When fixing the Brake Master Cylinder start by clamping its mounting flange in a workshop vise so you can reach the rear of the main Piston. Set up suitable brake fittings to the master cylinder ports for hose attachment following flare seat specifications. Install transparent hoses to these fittings and lead them to the master cylinder reservoir. Put delco supreme 11(R) brake fluid gm p/n 12377967 or its dot-3 brand equivalent into the reservoir through one end of the transparent hose lines until the fluid reaches half the container while keeping both hose tips fully under liquid. Use a rounded-end tool to control the primary Piston up and down multiple times; look at the fluid flowing from the ports. At the same time the primary Piston becomes harder to press and moves less with each bleed cycle. Repeat this step until clear fluid comes out smoothly from both ports without air present. When complete remove the transparent hoses from the reservoir then replace the master cylinder parts before disconnecting the hoses from their ports and putting down the master cylinder with a shop cloth to prepare for removal.