What is the function of the locking pin of the automobile brake

The brake guide pin has the function of the guide pin of the brake wheel cylinder to make the brake pad vertically act on the brake disc under the action of the brake piston. As for the rubber sleeve, it protects the guide pin from being exposed. If it is exposed, it is easy to see water rust and wear caused by falling dust and gravel.
Use of brake guide pin
Heavy trucks use air brakes, and ordinary cars use oil brakes. Therefore, the master brake cylinder and wheel brake cylinder are hydraulic brake pumps. The brake wheel cylinder (hydraulic brake pump) is an indispensable part of the brake system. When you step on the brake pad during braking, the brake master cylinder will send brake oil to each brake wheel cylinder through the pipeline.
The brake wheel cylinder has a connecting rod to control the brake shoes or brake pads. When braking, the brake oil in the brake oil pipe pushes the connecting rod on the brake wheel cylinder to make the brake shoes tighten the flange on the wheel to stop the wheel. The technical requirements of the brake wheel cylinder are very high, because it directly affects human life.