
According to the different installation positions on the vehicle, parking brake devices are divided into two types: central parking brake devices and wheel parking brake devices. The brake of the former is installed on the transmission shaft, called the central brake; the latter shares a set of brakes with the service brake device and is installed on each wheel hub. The four parts of the wheel brake are as follows: 1. Brake wheel cylinder: The function of the brake wheel cylinder is to convert the hydraulic energy input from the brake master cylinder into mechanical energy to put the brake into working condition. 2. Brake caliper: When braking, the brake fluid flows from the brake master cylinder through the brake pipe into the brake caliper, and the brake fluid pushes the caliper to press the brake pads, thereby stopping the vehicle. 3. Brake disc: It rotates when the vehicle is moving. The brake caliper clamps the brake disc to generate braking force. When the brake is applied, it clamps the brake disc to slow down or stop the vehicle. 4. Brake pads: The working principle of braking mainly comes from friction. The kinetic energy of the vehicle's movement is converted into heat energy after friction by using the friction between the brake pads and the brake disc (drum) and the friction between the tires and the ground, thereby stopping the vehicle.

When you open the hood to inspect car components, the brake system is typically located in a core position near the wheels. Specifically, in disc brake systems, you'll find the brake disc mounted on the hub with the caliper encircling it, applying friction directly to the wheel; rear wheels may use drum brakes, where the brake drum is built inside the hub in a compact space-saving design. This wheel-proximate layout allows braking force to transmit more directly, improving deceleration efficiency—imagine how braking force reaches the wheel area within milliseconds when pressing the pedal at high speed, reducing stopping distance. The location also facilitates heat dissipation, with finned designs preventing metal overheating and deformation. If brakes shift position or rust develops, uneven friction at the wheel position may cause vibration or failure. I always remind owners to check caliper and drum lining wear during each maintenance interval to ensure safety.

Having driven for many years, I can tell you that the brake components are primarily located at the wheels—each wheel has a braking assembly underneath. When you press the brake pedal, it connects to both the front and rear wheels, where the brake discs or drums are positioned inside the wheel hubs, directly clamping the wheels to slow down. In daily driving, their proximity to the wheels ensures responsive performance. However, during rainy weather, water splashes can easily contaminate the brake surfaces, potentially causing squeaking noises. It’s advisable to clean the wheel areas monthly to prevent rust. The thoughtful positioning also ensures that during emergency braking, heat won’t spread to the engine bay. For a quick inspection, just crouch and look inside the wheel rim to spot the outline of the brake disc—don’t overlook the risks of misalignment causing delayed response.

From a safety perspective, it is crucial that the brake is securely installed at the wheel position. Its direct proximity to the hub allows braking force to be applied instantly, reducing reaction time to avoid collisions. Disc brakes are more common on front wheels, with calipers positioned close to the inner side of the hub; drum brakes on rear wheels are slightly more recessed, but both require regular cleaning to prevent debris buildup that could impair functionality. The position design optimizes heat dissipation to prevent fire hazards—if brakes were located farther from the wheels, heat accumulation would accelerate, leading to failure. I emphasize that precise positioning directly impacts braking distance, and regular maintenance to ensure adequate brake pad thickness and correct alignment forms the critical defense line.


