The brake master cylinder is a crucial component in a vehicle's braking system. It converts the force applied by the driver on the brake pedal into hydraulic pressure, which is then transmitted through brake lines to the brake calipers or wheel cylinders at each wheel. This hydraulic pressure forces the brake pads or shoes against the brake rotors or drums, creating the friction needed to slow down or stop the vehicle.

Key Components of a Brake Master Cylinder:
Reservoir: Holds the brake fluid, which is essential for maintaining hydraulic pressure in the braking system.

Piston: When the brake pedal is pressed, the piston within the master cylinder moves, creating pressure in the brake lines.

Seals: Rubber seals prevent brake fluid from leaking and ensure the pressure is maintained within the system.

Brake Lines: These lines connect the master cylinder to the brake calipers or wheel cylinders and carry the hydraulic fluid under pressure.