You need to install a scan tool to the vehicle, start the engine and allow the engine to idle, follow the instructions on the scan tool to complete the automated bleed procedure, apply the brake pedal when instructed by the scan tool, turn the ignition OFF and remove the scan tool from the vehicle. Next, you can fill the brake master cylinder reservoir to the maximum-fill level 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, bleed the hydraulic brake system, with the ignition OFF, apply the brakes 3-5 times, or until the brake pedal becomes firm, slowly depress and release the brake pedal and observe the feel of the brake pedal. If the brake pedal feels spongy, repeat the automated bleeding procedure. If the brake pedal still feels spongy after repeating the automated bleeding procedure inspect the brake system for external leaks. Then you can turn the ignition key ON, with the engine OFF. check to see if the brake system warning lamp remains illuminated, drive the vehicle to exceed 13 km/h (8 mph) to allow ABS initialization to occur, and observe brake pedal feel. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake pedal is obtained.
By BobGM Specialist
28/10/2022