2001 GMC Savana 1500 Brake Booster

It is not recommended that dust boots be removed during inspection processes as dirt and debris could contaminate the Wheel Cylinder bore causing premature wear of the wheel cylinder. In addition, most bores should look damp and some lubricant may drip out from under the boot as a result of lubricant being present.

You need to remove the Brake Master Cylinder, secure the mounting flange of the brake master cylinder in a bench vise, clean the outside of the master cylinder reservoir, remove the reservoir cap and diaphragm, inspect the reservoir cap and diaphragm, remove the master cylinder reservoir, depress the primary piston, remove the piston retainer and the primary piston assembly, plug the cylinder inlet ports and the rear outlet port, apply low pressure, non-lubricated, filtered air into the front outlet port, and discard the primary piston assembly, the piston retainer, and the seals and seal retainer.

The procedure is to ensure that the brake master cylinder reservoir is full to the maximum-fill level, loosen and separate the front brake pipe, allow a small amount of brake fluid to gravity bleed, reconnect the brake pipe to the master cylinder port, depress the brake pedal fully and maintain steady pressure on the pedal, loosen the same brake pipe to purge air, tighten the brake pipe, release the brake pedal, loosen and separate the rear brake pipe, and ensure that both of the brake pipe-to-master cylinder fittings are properly tightened after completing the final master cylinder port bleeding procedure.