Brake Pedal Travel Measurement and Inspection

Brake Pedal Travel Measurement and Inspection

Note: The brake corners must be cool to obtain the most accurate measurement.

Note: To ensure the complete brake modulator and high pressure accumulator (HPA) pressure relief procedure is allowed to occur, the brake controller must see one pedal apply with the propulsion system enabled, followed by a proper shutdown without applying the brake pedal.

1. Enable the propulsion system.

2. Apply and release the brake pedal.

3. Place the transmission in PARK.

Note: The power button must be in the OFF position and without applying the brake pedal to ensure the brake modulator and HPA pressure relief occurs. This process will take approximately 1-3 minutes.

4. Place the power button in the OFF position, without applying the brake pedal.

5. Remove the remote keyless entry (RKE) transmitter and close all the vehicle doors.

6. Wait approximately 1-3 minutes until the brake modulator and HPA pressure relief is complete.

7. Inspect the battery state of charge. Refer to Battery Inspection/Test Battery Inspection/Test.

8. If necessary, connect a battery charger to the 12V battery. Refer to Battery Charging Procedures.

9. Install a scan tool to the vehicle.

10. Place the power button in the ON position without applying the brake pedal.

11. Using the scan tool, perform the following steps:

1. Select Diagnostics

2. Enter the VIN

3. Select Electronic Brake Control Module (EBCM)

4. Select Data Display

5. Scroll through the Data List, select and accept Brake Control Brake Pedal Position and Brake Master Cylinder Pressure Sensor

12. While observing the master cylinder pressure on the scan tool data display, using moderate speed and moderate effort, apply the brake pedal to a force of 5000 kPa (725 psi).

13. Record the distance displayed on the scan tool that the brake pedal has travelled at a pedal apply force of 5000 kPa (725 psi).

14. Release the brake pedal.

Maximum brake pedal travel, (measured with the power button ON, engine OFF and the brakes cool), at a brake pedal apply force of 5000 kPa (725 psi): 18 mm (0.71 in)