The electric parking brake actuator has a built-in DC motor. When the motor operates, the motor's speed is reduced by the drive screw mechanism, increasing torque. The spindle and the nut inside the caliper piston force it outward to generate brake pad clamping force. The electric parking brake actuators are automatically adjusted to compensate for brake pad wear, so no parking brake adjustment is necessary.

The electric parking brake switch is connected to the VSA modulator-control unit using four separate circuits. The control unit must see the correct voltage patterns on all 4 circuits, or the switch will be disabled and a DTC will be set.