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Disc Brake Working Principle
Jun 02, 2017

    Most modern cars are equipped with disc brakes on the front wheels, and even some of the four wheels are equipped with disc brakes. It is a part of a car brake system that really stops the car.

    The most common type of disc brakes mounted on modern cars are single-piston floating caliper disc brakes. Learn all about the design of this type of disc brakes.Disc Brake

    A brake pad, a caliper containing a piston, and a rotor mounted on the hub. Disc brakes are very similar to brakes on bicycles. The bicycle brake is provided with a caliper for pressing the brake pad onto the wheel. In a disc brake, the brake pad is pressed by a rotor rather than a wheel, and the pressure is transmitted in a hydraulic rather than a cable.

    The friction between the pad and the disc reduces the speed of the disc. The car in motion has a certain kinetic energy, and in order to stop the car, the brake must remove the energy from the car. How does the brake do this? Whenever you park, the brakes will convert kinetic energy into the heat generated by the friction between the pad and the disc. Most car disc brakes are ventilated.Disc Brake

    A set of blades is provided between the sides of the disc of the disc brakes with vent holes, and air can be drawn through the disc for cooling. Single-piston floating caliper disc brakes have automatic centering and automatic adjustment functions. Since the caliper can slide from one end to the other end, the caliper will move to the center position each time the brakes are used. Likewise, since there is no spring to pull the pad away from the disc, the pad always has a slight contact with the rotor (the rubber piston seal and any swings in the rotor actually drag the pad to keep it in a small section distance). This is important because the diameter of the piston in the brake is much larger than the diameter of the piston in the master cylinder. If the brake piston is retracted into the cylinder, it may be necessary to depress the brake pedal several times to draw enough oil into the brake cylinder to engage the brake pad.Disc Brake

    The old car has a double piston or four-piston fixed caliper design. One (or two) pistons on each side of the rotor push the side of the pad. Since the single-piston design is cheaper and more reliable, these two designs are now largely abandoned. At all wheels on which the wheels are fitted with disc brakes, the emergency brake must be activated by a mechanism independent of the main brake when all the main brakes are completely deactivated. Most cars use cables to start emergency brakes.Disc Brake

    There are some wheels equipped with four-wheel disc brakes, in the rear wheel wheel is equipped with a separate drum brakes. The drum brake is only used for emergency braking systems and is only started by cable; it does not have a hydraulic system. Some other cars will have a lever for rotating the bolt or starting the cam so as to hold the piston of the disc brake. The most common maintenance for the brake is to replace the lining. Typically, the disc brake pad will be provided with a metal sheet called a "wear indicator".