Brake Pedal Assy: Adjustments

Brake Pedal Switch Adjustment

WARNING: Before beginning any service procedure, REFER to Safety Warnings . Failure to follow this instruction may result in serious personal injury.

General Procedure

1. Inspect both brake pedal position switches and brake pedal assembly to verify there is no brake pedal pressure unintentionally applied due to incorrect brake pedal position switch or brake pedal installation.

1. Correct any concerns before proceeding to the next step.

2. Confirm that all brake pedal bracket fasteners are tightened to specifications. REFER to Hydraulic Brake Actuation .

3. Set the ignition to ON.

4. NOTE: Using the scan tool recording function makes it easier to observe the brake pressure sensor readings.
Using the IDS (Integrated Diagnostic System) scan tool, select DataLogger - Chassis - Braking - Brake Switch Parameters.

5. Slowly apply the brake pedal to generate the pressure graph for the master cylinder pressure (MC_PRES) PID (Parameter Identification).

1. The rate of brake pedal apply must not exceed 35 kPa (5.08 psi) per second as indicated by the scan tool.

6. Record the initial value of the MC_PRES PID (Parameter Identification) when BRAKE_LAMP and CRUISE_CANCL change from OFF to ON.

1. If BRAKE_LAMP and CRUISE_CANCL transition to ON before the MC_PRES PID (Parameter Identification) reads 304 kPa (44.09 psi) or less, the brake pedal position switch is correctly installed.

2. If BRAKE_LAMP and CRUISE_CANCL transition to ON after the MC_PRES PID (Parameter Identification) reads greater than 304 kPa (44.09 psi), remove and re-install the stoplamp switch and cruise control deactivation switch (if equipped). REFER to Stoplamp Switch and REFER to Clutch Pedal Cruise Control Deactivation Switch (if equipped). Clear all DTCs (Diagnostic Trouble Codes) and repeat Steps 3-6 to verify that the BRAKE_LAMP and CRUISE_CANCL transition to ON before the MC_PRES PID (Parameter Identification) reads 304 kPa (44.09 psi) or less. If the concern is still present, install a new stoplamp switch and cruise control deactivation switch (if equipped). REFER to Stoplamp Switch and REFER to Clutch Pedal Cruise Control Deactivation Switch (if equipped).