2001 GMC Yukon XL 1500 Brake Master Cylinder Bleeder Tool

When adding fluid to the brake master cylinder reservoir, use only Delco Supreme 110 (GM P/N 12377967) or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.

The proper way 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, fill the master cylinder reservoir to at least the half-way point with Delco Supreme 110 (GM P/N 12377967) or equivalent DOT-3 brake fluid, 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 as far as it will travel, continue to depress and release the primary piston until fluid flows freely from the ports with no evidence of air bubbles, 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, and the master cylinder from the vise.

When adding fluid to the brake master cylinder reservoir, you shall use only Delco Supreme II (GM P/N 12377967) or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.

The tools required include J 29532 Diaphragm Type Brake Pressure Bleeder and J 35589-A Brake Pressure Bleeder Adapter.

Anew Electro-Hydraulic Control Unit (EHCU) or new Brake Pressure Modulator Valve (BPMV) is installed. Air is trapped in the valve body. Do not drive the vehicle until the brake pedal feels firm. Do not reuse brake fluid that is used during the bleeding procedure. Use the vacuum, the pressure and gravity bleeding procedures only for base brake bleeding.