Then it sounds like you have a failed master cylinder.
Before going there, if there is air in the system, you need to bleed the ABS. That can only be done with a scan tool.
Procedure below.
Roy
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.
1. Raise and support the vehicle.
2. Remove all 4 tire and wheel assemblies.
3. Inspect the brake system for leaks and visual damage. Repair or replace components as needed.
4. Lower the vehicle.
5. Inspect the battery state of charge.
6. Install a scan tool.
7. Turn the ignition ON, with the engine OFF.
8. With the scan tool, establish communications with the ABS system. Select Special Functions. Select Automated Bleed from the Special Functions menu.
9. Raise and support the vehicle.
10. Following the directions given on the scan tool, pressure bleed the base brake system.
11. Follow the scan tool directions until the desired brake pedal height is achieved.
12. 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.
13. When the desired pedal height is achieved, press the brake pedal to inspect for firmness.
14. Lower the vehicle.
15. Remove the scan tool.
16. Install the tire and wheel assemblies.
17. Inspect the brake fluid level.
18. Road test the vehicle while inspecting that the pedal remains high and firm.
Friday, September 7th, 2018 AT 2:56 PM
