Perform a manual or pressure bleeding procedure. If the desired brake pedal height results are not achieved, perform the automated bleed procedure below. The procedure cycles the system valves and runs the pump in order to purge the air from the secondary circuits normally closed off during normal base brake operation and bleeding. The automated bleed procedure is recommended when air ingestion is suspected in the secondary circuits, or when the BPMV has been replaced.
Automated Bleed Procedure
- Raise the vehicle on a suitable support.
- Remove all four tire and wheel assemblies.
- Inspect the brake system for leaks and visual damage.
- Repair or replace as needed.
- Inspect the battery state of charge.
- Install a scan tool.
- Turn ON the ignition, with the engine OFF.
- With the scan tool, establish communications with the EBCM. Select Special Functions. Select
- Automated Bleed from the Special Functions menu.
- Bleed the base brake system.
- Follow the scan tool directions until the desired brake pedal height is achieved.
- If the bleed procedure is aborted, a malfunction exists. If the brake pedal feels spongy, perform the conventional brake bleed procedure again.
- When the desired pedal height is achieved, press the brake pedal in order to inspect for firmness.
- Remove the scan tool.
- Install the tire and wheel assemblies.
- Inspect the brake fluid level. Road test the vehicle while inspecting that the pedal remains high and firm.