ABS Automated Bleed Procedure: Notes
NOTE:
Refer to Brake Fluid Effects on Paint and Electrical Components Notice
in Cautions and Notices.
CAUTION:
Refer to Brake Fluid Irritant Caution
in Cautions and Notices.
IMPORTANT:
Before performing the ABS Automated Bleed Procedure, first perform a manual or pressure bleed of the base brake system. Refer to Hydraulic Brake System Bleeding (Manual)
or Hydraulic Brake System Bleeding (Pressure)
in Hydraulic Brakes. The automated bleed procedure is recommended when one of the following conditions exist:
- Base brake system bleeding does not achieve the desired pedal height or feel
- Extreme loss of brake fluid has occurred
- Air ingestion is suspected in the secondary circuits of the brake modulator assembly
The ABS Automated Bleed Procedure uses a scan tool to cycle the system solenoid valves and run the pump in order to purge any air from the secondary circuits. These circuits are normally closed off, and are only opened during system initialization at vehicle start up and during ABS operation. The automated bleed procedure opens these secondary circuits and allows any air trapped in these circuits to flow out toward the brake corners.