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Brake Light Switch

Brake light switch is a small device attached to the brake pedal mechanism. The brake light switch plays an important role in a modern car. 

A brake light switch


Many vehicle systems including Push-Button start, Antilock Brakes and Vehicle Stability Control cannot operate if a brake light switch is not working properly.

The brake light switch serves two major functions. First, it turns on the brake lights when a driver presses the brake pedal. Second, it sends the signal to the vehicle computer that brakes are applied. A car with a faulty brake light switch is UNSAFE to drive.

Illustration showing the relationship between a brake light (stop lamp) switch and the brake pedal

In most cars, the brake light switch is installed right above the brake pedal. Inside, it has a one- or two-way electric switch. The most common symptom of a faulty brake light switch is when brake lights don't come on or stay on all the time.

Brake Light Switch Problems
A faulty brake light switch can cause many problems. If a switch is bad, the brake lights won't operate and the transmission shifter will not come out of "Park" position. In cars with a push-button start system, a faulty brake light switch can cause the vehicle not to start.

Often, a brake light switch might be sticking and work intermittently. This can cause the Check Engine or ABS system warning light to come on on the dash. In some cases, brake lights may stay on all the time, or come on randomly, without pressing the brake pedal.

A brake light switch

Brake light switch testing
I recommend you leave this one for a good technician as it can be quite complex. In many cars, there is a special procedure to remove and install the brake light switch. If not installed correctly, the switch will not operate and can even be damaged. In some cars, the gap between the brake pedal and the switch must also be adjusted.

 If you insist however, search for the repair manual of your specific vehicle (model and year). 


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Email; vverteautosevcs@gmail.com
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