Buick 20995840 Sensor Assembly, Brake Pedal Position

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To remove the brake switch in vehicles from 2005 and earlier, start by removing the driver's side under-dash cover. Then, locate the switch at the top of the brake pedal bracket and twist it counterclockwise to remove it from the bracket. Disconnect the electrical connector from the switch. For installation, connect the electrical connectors to the switch and push the new switch into the clip until the switch plunger is fully depressed. Rotate the switch clockwise until it locks into position and no further adjustment is needed. Ensure that the brake lights are functioning properly. The rest of the installation process is the reverse of the removal. However, for vehicles from 2006 and later, a Brake Pedal Position (BPP) sensor is used, which requires a calibration procedure performed by a dealership service department or professional repair facility equipped for the necessary programming.

The brake light switch is at the top of the brake pedal bracket. To remove the switch, remove the insulator panel from below the knee bolster if equipped. Then, disconnect the electrical connector at the switch and rotate the switch counterclockwise while pulling to remove it. To install the new switch, rotate it clockwise while inserting it into the mounting bracket and connect the electrical connector. Finally, apply the brake pedal, release it, and verify that the brake lights turn off when the pedal is released.

To remove the brake light switch, remove the insulation panel and the knee bolster and disconnect the electrical connector at the switch. Remove the switch mounting fastener and remove the switch from the bracket. Install the switch to the bracket and tighten the switch mounting fastener securely.

The next step is to remove the mounting fastener and take out the sensor from the bracket.