Express 1500 RWD V8-5.3L (2008)
Pressure Modulator Valve Replacement (W/JL4))Brake Pressure Modulator Valve Replacement (w/o JL4) (See: Hydraulic Control
Assembly - Antilock Brakes/Service and Repair/Brake Pressure Modulator Valve Replacement (W/O JL4))
4. If the brake fluid was NOT contaminated with an oil-based or a silicone-based substance, but WAS contaminated with water or dirt, rust,
corrosion, and/or brake dust, replace the brake master cylinder reservoir cap diaphragm. The diaphragm may have allowed the moisture or
particles to enter the hydraulic system.
5. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme 11(R), GM P/N 12377967 (Canada P/N 992667) or
equivalent, DOT-3 brake fluid from a clean, sealed brake fluid container.
6. Pressure bleed the hydraulic brake system. Begin the procedure with the pressure bleeder reservoir filled to the maximum-fill level with the correct
brake fluid as indicated. Refer to Hydraulic Brake System Bleeding (Manual) (See: )Hydraulic Brake System Bleeding (Pressure) (See: ) .
