What is the working principle of the parking brake?

[RhettMarie]

The working principle of the parking brake is as follows: 1. For mechanical handbrakes, the rear wheel brake calipers are connected via steel cables or similar mechanisms. When the handbrake is pulled, the calipers press against the brake pads to achieve the parking function. 2. For electronic handbrakes, activating the parking switch engages a motor that drives steel cables or similar mechanisms to connect the rear wheel brake calipers. The calipers then press against the brake pads to achieve the parking function. 3. In some small cars, the handbrake is located behind the transmission, connected to the driveshaft where there is a brake disc similar to a disc brake. The pulling force is transmitted there via steel cables to achieve the parking brake function. 4. After pulling the handbrake, a hydraulic auxiliary cylinder is used to push the main hydraulic cylinder beneath the car, which then drives an air valve. Once the air valve is activated, it brakes the driveshaft. In this case, the handbrake only brakes the driveshaft. 5. After braking the driveshaft, in ordinary trucks, the handbrake lever's steel cable is pulled to achieve long-term braking.