Bleeding The Brake System (Abs); Auto Bleed Procedure - Chevrolet Trailblazer Service Manual

7. When bubbles cease to appear at the end of the bleeder hose, close the bleeder
screw and remove the hose.
8. Check the fluid level in the master cylinder and add fluid accordingly. Do this after
bleeding each wheel.
9. Fill the master cylinder reservoir to the proper level.

Bleeding the Brake System (ABS)

Auto Bleed Procedure

NOTE: Perform a manual bleeding procedure. If the brake pedal height and firmness
results are not achieved, perform the auto bleed procedure below.
1. Raise and support the vehicle.
2. Remove the tire and wheel assemblies.
3. Inspect the battery state of charge.
4. Install a scan tool.
5. Turn ON the ignition, with the engine OFF.
6. With the scan tool, establish communications with the ABS/TCS system. Select
Special Functions from the ABS/TCS menu. Select Automated Bleed from the
Special Functions menu.
7. Bleed the base brake system.
8. Follow the scan tool directions until the desired brake pedal height is achieved.
9. If the bleed procedure is aborted, a malfunction exists. Perform the following steps
before resuming the bleed procedure:
10. If a DTC is detected, refer to Diagnostic Trouble Code (DTC) List and diagnose the
appropriate DTC.
11. If the brake pedal feels spongy, perform the conventional brake bleed procedure
again.
12. When the desired pedal height is achieved, press the brake pedal in order to
inspect for firmness.
13. Remove the scan tool.
14. Install the tire and wheel assemblies.
15. Inspect the brake fluid level.
16. Road test the vehicle while inspecting that the pedal remains high and firm.