Chevrolet 85105169 CYLINDER ASM-BRK MAS

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Start the engine and turn it off after a minute or two. Slowly depress the brake pedal several times and observe if the pedal goes down farther initially but gradually rises after subsequent depressions. Additionally, depress the brake pedal while the engine is running and stop the engine while keeping the pedal depressed. If there is no change in the pedal reserve travel after holding it for 30 seconds, the booster is airtight.

To remove the master cylinder, start by removing as much fluid as possible from the reservoir using a syringe or turkey baster. Place rags under the fluid fittings and prepare caps or plastic bags to cover the ends of the lines once they are disconnected. Loosen the fittings at the ends of the brake lines and plug the ends to prevent contamination. Disconnect the electrical connector at the brake fluid level switch, if equipped, and remove the nuts attaching the master cylinder to the power booster. Carefully pull the master cylinder off the studs and out of the engine compartment.

To install the booster, use a new gasket and tighten the booster and master cylinder mounting nuts to the specified torque values. If working with a hydraulic booster, bleed the power steering system and check the fluid level.

To remove the master cylinder, start by removing as much fluid as possible from the reservoir using a syringe or turkey baster. Place rags under the fluid fittings and prepare caps or plastic bags to cover the ends of the lines once they are disconnected.