It consist of 5 parts :
1. Reservoir
It is the storage tank used for storing the brake fluid in hydraulic type of braking system, usually it is made up of plastic.
2. Cylinder
It is the air tight housing inside which the piston moves with the moment of brake pedal which in turn causes conversion and multiplication of force. Cylinder is usually made up of cast iron or aluminium.
It is connected with the reservoir through inlet valve and also with brake lines through outlet valve.
In single circuit m c there is only 1 compression chamber.
3. Piston
It is the reciprocating part of the master cylinder that reciprocates inside the cylinder due to the movement of brake pedal, the piston causes compression of brake fluid inside the cylinder which in turn generates high hydraulic pressure.
In single circuit only 1 piston is used.
4. Returning Spring
It is the simple coil type of spring used inside the cylinder which helps the piston and brake pedal to retain its original position after brake pedal is released.
5. Valve
In single circuit m c it is the outlet valve through which the brake line is attached, The compressed brake fluid is further transferred to the caliper through this valve.