This will then slow the drums down, which in turn will slow down the car’s wheels. These pistons will move the brake shoes outwards and they will come into contact with the drum. When you apply the brakes, the hydraulic pressure will push the pistons inside the wheel cylinder. The drum that rotates with the wheels houses these components. A drum brake consists of the backplate which serves as the base, the brake shoes, and the wheel cylinder which contains pistons and is connected to the hydraulic system. However, it has a different design to disc brakes. This is why you need them serviced or replaced from time to time.Īs mentioned, drum brakes also operate with hydraulic pressure and use friction to slow down the car. Over time, they will wear down and they won’t work as well. The rotor, the caliper, and the brake pads all have to deal with a lot of friction and heat when you brake. When the brake pads inside the calipers come into contact with the rotor, they will slow the rotation of the rotor which slows down your wheels and your car. Once the fluid reaches the cylinders, it will move the pistons which then move the calipers inwards. This will then pump the brake fluid through the brake lines into the secondary cylinders at each of the wheel’s brakes. When you press the brake pedal (if you want to learn more, check out our guide on which one is the brake), the master cylinder will apply hydraulic pressure to the system. Additionally, some pistons will force the calipers to move with the help of hydraulic pressure, cylinders, and all the brake fluids. Within the calipers are the brake pads that will come in contact with the rotor. The disc brake consists of a rotor (the disc) that attaches to the wheel hub, which sits inside a caliper. But since most modern cars use disc brakes, we’ll focus on disc brakes first. They have different designs but both of them use hydraulic pressure to operate and stop the car by using friction. There are two types of brakes: disc and drum brakes. But why do they need servicing? Why do they wear down? Well, let us explain how your braking system works and why they need servicing or even a replacement job from time to time. It’s obvious just how important car brakes are.
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