stepping on the brake after the main pump to produce thrust hydraulic pressure to the sub pump, the piston within the pump by the liquid pressure began to move the brake disc drive. The oil brake is composed of a brake master pump and a brake oil storage tank. They were attached to the brake pedal, with one end attached to the brake tubing. The brake master pump is provided with a brake oil, and an oil outlet and an oil inlet. When the brake is pressed, the oil outlet is opened, and the oil inlet is closed. Under the pressure of the piston of the pump body, the brake oil pipe is pushed out of the oil pipe to brake the flow of each brake. When you release the brake. The oil outlet of the brake master pump is closed, and the oil inlet is opened, so that the brake oil flows back to the brake master pump from the brake branch pump and returns to the original state.