Caution: Refer to Safety Glasses Caution in the Preface section.
Caution: Refer to Vehicle Lifting Caution in the Preface section.
Caution: Refer to Brake Dust Caution in the Preface section.
Caution: Refer to Brake Fluid Irritant Caution in the Preface section.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.
Important: Before performing the Antilock Brake System
Automated Bleed Procedure, first perform a pressure bleed of the base brake system.
Refer to
Hydraulic Brake System Bleeding
.
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 hyraulic modulator
assembly. |
- The Antilock Brake System 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
initialisation 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 calipers.
Performing the Automated Bleed Procedure
Notice: The Auto Bleed Procedure may be terminated at any time during the process
by pressing the EXIT button. No further Scan Tool prompts pertaining to the
Auto Bleed procedure will be given. After exiting the bleed procedure, relieve
bleed pressure and disconnect bleed equipment per manufacturers instructions.
Failure to properly relieve pressure may result in spilled brake fluid causing
damage to components and painted surfaces.
- Raise and support the vehicle. Refer to
Lifting and Jacking the Vehicle
.
- Remove all four wheels. Refer to
Tire and Wheel Removal and Installation
.
- Inspect the brake system for leaks and visual damage. Refer to
Symptoms - Hydraulic Brakes
, repair or replace components
as needed.
- Lower the vehicle.
- Inspect the battery state of charge. Refer to
Battery Inspection/Test
.
- Install a scan tool.
- Turn the key to the ignition ON, engine OFF position.
- With the scan tool, establish communications with the ABS system. Select
Special Functions. Select Automated Bleed from the Special Functions menu.
- Raise and support the vehicle. Refer to
Lifting and Jacking the Vehicle
.
- Following the directions given on the scan tool, pressure bleed the base
brake system. Refer to
Hydraulic Brake System Bleeding
.
- Follow the scan tool directions until the desired brake pedal height is
achieved.
- If the bleed procedure is aborted, a malfunction exists. Perform the following
steps before resuming the bleed procedure:
- When the desired pedal height is achieved, press the brake pedal to inspect
for firmness.
- Lower the vehicle.
- Remove the scan tool.
- Install the tyre and wheel assemblies. Refer to
Tire and Wheel Removal and Installation
.
- Inspect the brake fluid level. Refer to
Master Cylinder Reservoir Filling
.
- Road test the vehicle while inspecting that the pedal remains high and
firm.