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What is the working principle of a 4-wire brake switch?

1 Answers

OEmiliano

07/29/25 5:13pm

4-wire brake switch works with two brake switches, one normally open and one normally closed. When the brake is pressed, the normally open switch closes, and the normally closed switch opens. Here is the principle of brake light switch wiring: 1. Four wires of the switch: The car brake light switch has four wires, one is a 12-volt power supply, and the other two are brake signal lines to the ABS system ECU and automatic transmission ECU. 2. Rear brake indicator light: Another wire goes to the rear brake indicator light. Some high-end models share one line for ABS and automatic transmission, and an additional brake signal line is added for the electronically controlled suspension. 3. Brake light switch: Therefore, among the several wires on the brake light switch, except for one power line, the others are connected to control units that require brake signals, and the rear brake indicator light is controlled by the vehicle lighting system.

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