2008 Buick Enclave Brake Master Cylinder

The procedure is to secure the mounting flange of the brake master cylinder in a bench vise, remove the master cylinder reservoir cap and diaphragm, install suitable fittings to the master cylinder ports and transparent hoses to the fittings installed to the master cylinder ports, route the hoses into the master cylinder reservoir, fill the master cylinder reservoir to at least the half-way point with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container, ensure that the ends of the transparent hoses running into the master cylinder reservoir are fully submerged in the brake fluid, depress and release the primary piston, observe the flow of fluid coming from the ports, continue to depress and release the primary piston until fluid flows freely from the ports with no evidence of air bubble, remove the transparent hoses from the master cylinder reservoir, install the master cylinder reservoir cap and diaphragm, remove the fittings with the transparent hoses from the master cylinder ports, wrap the master cylinder with a clean shop cloth to prevent brake fluid spills, and then remove the master cylinder from the vise.

You will need to turn the ignition switch to the off position, apply the brake pedal several times, remove the air cleaner element and the brake fluid from the brake master cylinder reservoir, discard the brake fluid into an approved container, disconnect the master cylinder fluid level sensor electrical connector, and then remove the windshield washer solvent heater.

The master cylinder reservoir has a total of 2 seals.

The Brake Master Cylinder has a total of 2 nuts.

You will need to remove the brake fluid from the brake master cylinder reservoir, discard the brake fluid into an approved container, and then remove the air cleaner element and the windshield washer solvent heater if equipped.