GM Service Manual Online
For 1990-2009 cars only

The stoplamp switch will self-adjust the first time the brake pedal returns to its stop after you install the switch.

  1. Apply the brake pedal.
  2. Push the switch in until the switch seats firmly in the clip.
  3. Clicks can be heard as the threaded portion of the switch is pushed through the clip.

  4. Pull the brake pedal against the pedal stop until you no longer hear a click.
  5. Electrical contact should occur when you apply the brake pedal for a distance of 11-24 mm (0.45-0.95 in).