Impala V6-3.5L VIN N (2006)
Brake Bleeding: Service and Repair
Antilock Brake System Automated Bleed Procedure
ABS Automated Bleed Procedure
Bleeding the ABS System
Caution: Refer to Brake Fluid Irritant Caution in Service Precautions.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Service Precautions.
Perform a manual or pressure bleeding procedure. Refer to Hydraulic Brake System Bleeding (Manual) Hydraulic Brake System Bleeding (Pressure).
If the desired brake pedal height results are not achieved, perform the Automated Bleed Procedure.
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
brake pressure modulator valve (BPMV) has been replaced.
Automated Bleed Procedure
1. 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 the vehicle on a suitable support. Refer to Lifting and Jacking the Vehicle.
2. Remove all 4 tire and wheel assemblies.
3. Inspect the brake system for leaks and visual damage. Refer to Brake Fluid Loss or Symptoms - Hydraulic Brakes. Repair or replace as needed.
See: Brakes and Traction Control/Hydraulic System/Testing and Inspection/Symptom Related Diagnostic Procedures/Brake Fluid Loss See:
Brakes and Traction Control/Hydraulic System/Testing and Inspection/Symptom Related Diagnostic Procedures
4. Inspect the battery state of charge. Refer to Battery Inspection/Test. See: Starting and Charging/Testing and Inspection/Component Tests and
General Diagnostics/Battery Inspection/Test
5. Install a scan tool.
6. Turn ON the ignition, with the engine OFF.
7. With the scan tool, establish communications with the electronic brake control module (EBCM). Select Special Functions. Select Automated
Bleed from the Special Functions menu.
8. Bleed the base brake system. Refer to Hydraulic Brake System Bleeding (Manual) Hydraulic Brake System Bleeding (Pressure).
9. Follow the scan tool directions until the desired brake pedal height is achieved.
10. If the bleed procedure is aborted, a malfunction exists. Perform the following steps before resuming the bleed procedure:
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If a DTC is detected, refer to Diagnostic Trouble Code (DTC) List - Vehicle and diagnose the appropriate DTC. See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Descriptions
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If the brake pedal feels spongy, perform the conventional brake bleed procedure again. Refer to Hydraulic Brake System Bleeding (Manual)
Hydraulic Brake System Bleeding (Pressure).
11. When the desired pedal height is achieved, press the brake pedal in order to inspect for firmness.
12. Remove the scan tool.
13. Install the tire and wheel assemblies.
14. Inspect the brake fluid level.
15. Road test the vehicle while inspecting that the pedal remains high and firm.
