When the brake is applied, the oil outlet opens and the oil inlet closes. Under the working pressure of the piston rod of the pump body, the brake oil pipe is squeezed and the oil pipe flows to each brake pump for the function of the brake system. When the brake pads are released. The oil outlet in the brake master cylinder will be closed, and the oil inlet will be opened, so that the brake fluid flows from each brake pump back to the brake master cylinder and returns to the original condition.
Driven by the air pump according to the engine, the gas is compressed to a high pressure and stored in the gas storage tank. One of the air reservoirs can be connected to the brake master cylinder through a pipeline. The brake master cylinder is divided into upper and lower brake chambers, the upper brake chamber controls the rear wheel, and the lower brake chamber controls the front wheel. When the driver steps on the brake pedal, the upper air is opened first, and the high-pressure gas of the air tank is transmitted to the relay valve, and the operating piston rod of the relay valve is pushed to a new one. The valve is connected to the two rear brake pumps. The push rod of the brake pump is pushed forward. According to the adjustment back, the cam is rotated for a perspective. The cam is axial force. While rotating, the brake shoe is expanded and the brake drum is rubbed to achieve the actual effect of the brake.
When the upper chamber of the brake master cylinder opens, the lower chamber also opens, and the high-pressure gas enters the quick release valve, which is then distributed to the brake pumps of the two front wheels. The same goes for the rear tires.
When the driver releases the brake pedal, the upper and lower brake air chambers are turned off, and the piston rods of the quick-entry valve of the front wheel and the relay valve of the rear tire are returned under the action of the spring. The front and rear brake pumps are connected to the atmosphere of the brake air chamber, the push rod is returned, and the braking is completed.
Usually all the rear tires brake first, and the front tires wait, which is conducive to the driver's control of the position.