How to Perform ABS Bleed for GM Chevrolet Avio
by Dave Jack Auto Car Repair KnowledgeThe 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
Caution:
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.
1. Raise the vehicle on a suitable support. Refer to Lifting and Jacking the Vehicle.
2. Remove all four tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation.
3. Inspect the brake system for leaks and visual damage. Refer to Brake Pipe and Hose
Inspection or Symptoms - Hydraulic Brakes. Repair or replace as needed.
4. Inspect the battery state of charge. Refer to 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 EBCM. Select Special Functions. Select
Automated Bleed from the Special Functions menu.
8. Bleed the base brake system. Refer to Hydraulic Brake System Bleeding.
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:
• If a DTC is detected, refer to Diagnostic Trouble Code (DTC) List - Vehicle and diagnose the appropriate DTC.
• If the brake pedal feels spongy, perform the conventional brake bleed procedure again.
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. Refer to Tire and Wheel Removal and Installation.
14. Inspect the brake fluid level.
15. Road test the vehicle while inspecting that the pedal remains high and firm.
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Created on Apr 9th 2021 01:49. Viewed 104 times.