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Home >> Subaru >> 2016 >> WRX Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brake System >> Stop Light Switch >> Adjustment

Stop Light Switch: Adjustment

  1. Measure the brake pedal stroke which turns on the stop light switch.
    1. Release the steering wheel lock, tilt the steering column to the lowest end and fully retract the column by the telescopic system.
    2. Affix the masking tape (a) to protect the steering wheel from damage, pass the measure (b) through the steering wheel and fix it to the vertical center position of the brake pedal.
      CAUTION: If the measure (b) interferes with the knee airbag module, remove the knee airbag module. Ref. to REMOVAL
      G13950141Courtesy of SUBARU OF AMERICA, INC.
    3. Set the measure (b) so that it becomes straight from the brake pedal, and add a marking (c) on the masking tape (a).
      G13950142Courtesy of SUBARU OF AMERICA, INC.
    4. Operate the brake pedal, and read the position where the stop light illuminates (the amount of the pedal stroke) using the marking added in the previous step.
  2. Add a making (a) to the threaded portion of the stop light switch.
    G00678794Courtesy of SUBARU OF AMERICA, INC.
  3. Remove the stop light switch. Ref. to REMOVAL .
  4. Adjust the stop light switch so that the position where the stop light illuminates (pedal stroke volume) comes within the standard.

    Specification: 

    4 mm (0.16 in) or more, 6 mm (0.24 in) or less

    CAUTION:
    • If the stop light illuminating position is less than 3 mm (0.12 in), it may lead to an incorrect stop light illumination by vibrations etc. even when the brake pedal is not operated while driving.
    • Perform the operation while supporting the brake pedal by pulling it upward.
    NOTE:
    • To adjust the installation position of the stop light switch, shift the threads. By shifting the thread by one pitch, the stop light illumination timing changes 4 mm (0.16 in) - 5 mm (0.2 in). When further precise adjustment is necessary, perform adjustment by the operating rod.
    • The stop light illumination timing becomes later by pushing in the stop light switch toward the vehicle front, and becomes earlier by pushing in toward the vehicle rear.
    1. Align the groove of clip with the cutout portion of stop light switch push rod.
    2. Pull up the brake pedal toward you, let the push rod of the stop light switch stroke, and push in the stop light switch until it reaches the stopper.
      CAUTION: When pushing the stop light switch against the stopper, do not apply excessive force.
    3. Turn the stop light switch clockwise by 45° to secure.
      CAUTION: The turning torque of stop light switch should be 3 N.m (0.3 kgf-m, 2.2 ft-lb) or less. If it is hard to turn the stop light switch, reduce the switch pushing force and turn it again.
  5. When precise adjustment is necessary, perform adjustment by the operating rod.
    1. Loosen the lock nut of the operating rod, and rotate the rod so that the stop light illumination position (pedal stroke volume) comes within the standard value.
    2. Tighten the lock nut.

      Tightening torque: 

      22 N.m (2.2 kgf-m, 16.2 ft-lb)

  6. After adjustment, make sure that the stop light illuminates normally.
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