The typical brake system consists of disc brakes that are found in the front and either disc and or brake drums in the rear linked by a system of tubes and hoses that connect the brake at each wheel to the master cylinder. Other components that are connected with the brake system are inclusive of the Parking brakes, power brake boosters plus the anti-lock system.
Ideally, when you step on the brake pedal, you are actually pressing against a plunger in the master cylinder, which then forces hydraulic oil (the brake fluid) through a series of tubes and hoses to the braking unit of each wheel. Since hydraulic fluid cannot be compressed, pushing fluid through a pipe is just the same thing as pushing a steel bar through a pipe. But unlike a steel bar, however, the fluid can be pushed through many twists and turns on its way to its destination, arriving with the exact same motion and pressure that it began with. Thus It is very important that the fluid is pure liquid and that there are no air bubbles in it. Air can compress which may result in sponginess to the pedal and severely reduced its braking efficiency. If air is suspected, then the system must be bled to remove the air. There are “bleeder screws” at each wheel cylinder and caliper for this activity.
SEE ALSO:WHAT MAKES BRAKE ROTORS TURN BLUE