How to Install Brake Light Switch

The brake light switch on an automobile is responsible for turning on and off the brake lights. Without the switch, the brake lights would not light up, potentially causing a rear-end collision. There is no service interval for the switch, so switches can fail at any time. However, most switches have a long service life of 100,000 miles or more. The switch itself is a small relay that is attached to the back of the brake pedal. Once you've removed the old switch, you'll need to install a new one.

Difficulty: Moderate

Instructions

Things You'll Need:

• Socket wrench
• Socket set

1. Slide the push rod end of the brake light switch through the back of the mounting bracket behind the brake pedal.

2. Tighten the retaining nut on the bracket to hold the brake light switch in place.

3. Connect the electrical plug to the back of the brake light switch.

4. Depress the brake pedal and align the mounting bracket on the back of the brake pedal with the mounting bracket on the brake booster diaphragm.

5. Slide the brake pin through the brake booster mounting bracket to connect the brake pedal to the brake booster.

6. Slide a cotter pin through the hole in the end of the brake pin and bend the pin down so that the brake pin will not slide out of the bracket.

Tips & Warnings

• For specific information about your vehicle's brake light switch, consult the particular vehicle's manual (see Resources).

Resources

• Automobile Service Manuals