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Home >> Mercedes Benz >> 2019 >> GLC300 Base >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brakes - Hydraulic & Mechanical Systems - 253 Chassis - 1 Of 2 >> Basic Knowledge >> Brake Light Switch, Basic Function - GF42.10-P-2001A

Brake Light Switch, Basic Function - GF42.10-P-2001A

Model all (CAR) 

Shown on model 177.0 

G12939321Courtesy of MERCEDES-BENZ USA

Overview 

This document contains information on:

Location 

The brake light switch is located to the left of the brake pedal.

Function 

The brake light switch consists of a shaft with ring magnet. The ring magnet rotates in a printed circuit board with stator in two fixed Hall elements. This produces a change in the voltage. The information about the brake pedal position is routed to the Electronic Stability Program control unit in the form of two signal voltages.