The housing of the brake master cylinder is equipped with a front cylinder piston, a rear cylinder piston and a front cylinder spring and a rear cylinder spring.
The front cylinder piston is sealed with a sealing ring; the rear cylinder piston is sealed with a sealing ring and positioned with a retaining ring. The two liquid reservoirs are respectively communicated with the front chamber B and the rear chamber A, and are communicated with the front and rear brake wheel cylinders through their respective oil outlet valves. The front cylinder piston is pushed by the hydraulic force of the rear cylinder piston, and the rear cylinder piston is directly pushed by the push rod. .
When the brake master cylinder is not working, the piston head and the leather cup in the front and rear chambers are located between their respective bypass holes and compensation holes. The elastic force of the front cylinder piston return spring is greater than that of the rear cylinder piston return spring to ensure that the two pistons are in the correct position when they are not working.