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Electronic Parking Brake Principle?

2 Answers

McJaxon

07/25/25 5:40am

Electronic parking brake works on the same principle as mechanical handbrake, achieving parking by friction clamping between brake shoes and brake hubs or friction pads and brake discs. However, the control method replaces manual operation and mechanical linkage with electronic buttons and motor actions, hence the full name of this system is Electronically Controlled Mechanical Parking Brake System. Electronic parking brakes can be divided into two types: cable traction type and integrated caliper type. 1. Working principle of cable-type electronic parking brake: When the driver presses and holds the electronic parking brake switch, the emergency braking function is activated. When the service brake is working normally, the ESP system (Electronic Stability Program) controls the service brake to apply braking force to all four wheels. If the service brake fails, the electronic parking brake control unit evaluates signals from the four wheel speed sensors, applies braking force to the rear wheels and prevents them from locking; in this case, the request to illuminate the brake light is sent by the electronic parking brake control unit. 2. Working principle of caliper-type electronic parking brake: The driver uses the parking brake by pulling the electronic parking brake button, and the parking brake control module motor located on the rear wheel brake caliper starts to rotate, applying braking force to the brake disc; at the same time, the traditional hydraulic brake also intervenes to make the braking response more agile. When the vehicle is parked, the driver can automatically release the parking brake by pressing the accelerator pedal or the brake pedal (applying a braking force of 10bar).

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VanessaLynn

08/10/25 5:50pm

Last time I studied this principle in the garage, the electronic parking brake essentially replaces our old-fashioned manual handbrake lever with an electric motor. When you press that button, it sends a signal to the controller, which immediately commands the motor to rotate. There are two key implementation methods: one uses a steel cable to pull the brake pads inside the rear wheel calipers, similar to the mechanical principle; the other is more advanced, integrating a micro motor directly into the rear brake calipers to drive the piston and press against the brake disc. My favorite feature is its automatic release—just fasten your seatbelt, shift to D gear, and lightly press the accelerator, and the parking brake releases itself. It even prevents rollback on slopes, making it super convenient.

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