The brake master cylinder belongs to a one-way acting piston hydraulic cylinder. Its function is to convert the mechanical energy input by the pedal mechanism into hydraulic energy. There are two types of brake master cylinders: single-chamber and double-chamber, which are used in single-circuit and double-circuit hydraulic brake systems, respectively.
In order to improve the driving safety of the car, according to the requirements of traffic regulations, the vehicle's service brake system now uses a dual circuit brake system, which is composed of a tandem dual cavity master cylinder (single cavity brake master cylinder has been eliminated) Dual circuit hydraulic brake system.
At present, almost all of the dual-circuit hydraulic brake systems are servo brake systems or dynamic brake systems. However, in some miniature or light vehicles, in order to make the structure simple, there are also some models that use tandem dual-cavity brake master cylinders to form dual-circuit manual hydraulic brakes when the brake pedal force does not exceed the driver's physical strength system.
1. When the driver depresses the brake pedal, the master cylinder piston moves forward to close the bypass hole. Then, the oil pressure is established in front of the piston. Then the oil pressure is delivered to the brake cylinder via the pipeline.
2. When the brake pedal is released, the master cylinder piston returns under the action of the oil pressure and the return spring. After the brake system pressure drops, after the piston returns, the excess oil returns to the oil pot.
3. When the two feet brake, the oil from the oil pot enters the front of the piston from the compensation hole, which increases the oil in front of the piston. Then, when braking, the braking force increases.