Electric Parking Brake (EPB)
An electronically controlled parking brake system that uses electric motor actuators on the calipers to lock the brakes.
The Electric Parking Brake (EPB) is a modern electronic replacement for the traditional mechanical handbrake lever or foot pedal. Instead of pulling a steel cable to engage the rear brakes, the driver presses or pulls a small switch on the dashboard or center console.
When the switch is activated, an electronic control module sends power to electric motor actuators integrated directly into the rear brake calipers. These motors drive a gear mechanism that forces the caliper pistons to press the brake pads against the rotors, locking the rear wheels in place.
EPB systems offer several convenience and safety benefits, such as automatic engagement when the vehicle is parked and automatic release when driving away. They also save space in the center console and can integrate with hill-start assist systems to prevent the vehicle from rolling backward on inclines.
Diagnosing and servicing EPB systems requires specialized scan tools. For example, before replacing rear brake pads, a mechanic must use a scan tool to put the EPB motors into 'service mode,' retracting the electric actuators so the pistons can be pushed back.