Automated Bleed
The Automated Bleed procedure is to be performed when the brake pressure modulator valve (BPMV) is replaced. Perform the procedure as follows.
IMPORTANT:
The base brake system must be bled before proceeding. Refer to Hydraulic Brake System Bleeding (Manual)
or Hydraulic Brake System Bleeding (Pressure)
in Hydraulic Brakes.
IMPORTANT:
If the brake system warning lamp is illuminated, DO NOT allow the vehicle to be driven until the concern is diagnosed and repaired. Refer to Symptoms - Hydraulic Brakes
in Hydraulic Brakes.
- Ensure that the master cylinder reservoir is filled to at least the minimum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container.
- Ensure the master cylinder reservoir cap is ON securely.
- Install a scan tool.
- Turn ON the ignition.
- Select the VSES Special Functions menu on the scan tool.
- Select Pre-charge Bleed.
- Press the On key. The precharge pump runs for approximately 3 seconds, circulating fluid from the master cylinder fluid reservoir, through the precharge pump and combination valve, then back to the master cylinder.
- Select Automated Bleed.
- Press the On key. The precharge pump and ABS pump run for approximately 6 seconds while air is purged from the BPMV.
- Ensure that the master cylinder reservoir is filled to at least the minimum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container.
- Perform a base brake system bleed. Refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure) in Hydraulic Brakes.
- Evaluate the feel of the brake pedal. If the pedal feels spongy, repeat steps 1-11. If the pedal feel is acceptable, proceed to the next step.
- Ensure that the master cylinder reservoir is filled to at least the minimum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container.