Use only GM SUPREME 11 (GM #1052542) or equivalent DOT 3 brake fluid from a clean, sealed container. Do not use fluid from an open container that may be contaminated with water. Improper or contaminated fluid could result in damage to components or loss of braking, with possible personal injury.
Overfilling the brake fluid reservoir must be avoided due to the potential for overflow onto the nearby catalytic converters in the exhaust system. Brake fluid is flammable, and contact with hot exhaust components could result in a fire and possible personal injury. Do NOT allow brake fluid to spill on or come in contact with the vehicle's finish as it will remove the paint. In case of a spill, immediately flush the area with water.
If any brake component is repaired or replaced such that air is allowed to enter the brake system, the entire bleeding procedure MUST be followed. Prior to bleeding the brakes, the front and rear displacement cylinder pistons must be returned to the topmost position. The preferred method uses a Tech 1® or equivalent scan tool to perform the rehoming procedure. If a scan tool is not available, a second procedure may be used, but it is extremely important that the procedure be followed exactly as outlined.
A bleeding operation is necessary to remove air when it has been introduced into the hydraulic brake system (by disconnecting brake lines or if the brake fluid reservoir has been allowed to run dry).
It is necessary to bleed the system at all four brakes. If a brake hose or steel brake line has been disconnected at one wheel, only that wheel caliper (or wheel cylinder, as equipped) needs to be bled. If brake lines or hoses are disconnected at any fitting located between the master cylinder and the brakes, then the brake system served by the disconnected brake line must be bled.
Before bleeding the ABS brake system, the front and rear displacement cylinder pistons must be returned to the topmost position. The preferred method uses a Tech 1® or T-100® scan tool to perform the rehoming procedure. If a Tech 1® is not available, the second procedure may be used, but it must be followed EXACTLY.