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10 Disc Brake Components and Its Function

The existence of the brakes on the car is a vital part because it is one of the factors that ensure security and safety in driving. The main function of the braking system is to reduce the speed or to stop the vehicle from moving forward or backward.

Brembo Disc Brake
Usually, there are two types of braking systems found in vehicles, namely drum brakes, and disc brakes. Of course, both have their advantages and disadvantages. But these two types of brakes have the same function and purpose. This time, will not discuss drum brakes, but we will talk about disc brakes components you want to know.

A Little Explanation About How Disc Brakes Work

As one of the vital spare parts on a vehicle, it turns out that the working principle of the brakes is to take benefit of changes in the force of motion on the wheels into heat energy.

So, several components of disc brakes are in direct contact with other parts attached to the wheels, and as a result, the wheel rotation can slow down and stop.

The workings of the disc brakes are split into several parts where each other is interconnected. Braking occurs due to channeling pressure from the pedal or handle to the pad brake.

The pressure distribution process will use compressive power, which usually comes from the hydraulic system by utilizing the piston and brake fluid.

When the pressure reaches the pads brakes, they will automatically pinch the disc that is spinning along with the wheel rotation.

Therefore rotation will decrease, and the vehicle's speed will slow down. That's just a little explanation of how the disc brakes work.

Disc Brake Components You Need To Know

According to our current automotive topic, of course, you are curious about disc brake components and their functions. Well, you can find out the details through the following discussion.

1. Disc

The disc serves as a medium of pressure by the brake pad and is usually made of heat-resistant steel material.

When pressure occurs, there will be a breaking effect.

Disc brake components

There are two types of disc brakes, namely solid and ventilated disc.

  • Solid disc

Solid disc brakes are generally found on four-wheeled vehicles or cars.

Solid disc

Usually, the type of disc is made of better heat-resistant and friction-resistant steel material. The shape does not have many holes because it aims to produce a stronger grip.

  • Ventilated disc

Ventilated discs are usually found on two-wheeled vehicles or motorcycles.

Ventilated disc

The material is steel but generally has a thinner size. Friction between the disc and brake pad causes heat. Therefore, some of the existing holes function to make the disk cool faster.

2. Brake Pad

The brake pad will press then hold the disc rotation while the wheel is spinning.

Brake pad

Brake pads can be made of organic, semi-metallic, or ceramic materials.

3. Brake Caliper

The function of the brakes caliper is not much different from the master cylinder as part of the drum brake.

Brake caliper

Calipers on brakes change the hydraulic from the piston into the power of motion in the form of pressure.

In general, caliper for brakes is divided into two types, namely fixed and floating caliper.

  • Fixed Caliper

A fixed caliper has two pistons that will move the opposite when this component gets pressure. The movement then clamped the brake pad between the two pistons.

  • Floating Caliper

As the name implies, the floating caliper is a brake caliper component that is made to float to be able to move to the right and left.  Also, this type has only one piston on one side.

4. Piston

The piston is not only found on the engine but also the disc brake components in the form of tubes.


In general, the piston position directly in contact with the brake lining. When pressure occurs, the piston will press the brake pad evenly.

5. Piston Seal

Piston seals have a shape or are made of rubber. However, this is different from an ordinary rubber.


Piston seal can avoid brake fluid leakage on the brake caliper.

6. Nipple Bleed

Nipple Bleed is the next important component because disc brakes rely on a hydraulic system.

Nipple bleed

Its principal function is to remove the air content that is accidentally carried by the hydraulic system.

7. Hydraulic Hose

Hydraulic hose is a little different from the hoses you often see, including fuel line or radiator hoses.

hydraulic hoses for brake

The hydraulic system has tremendous compressive power. Therefore, it requires quality and strong hose that can resist high pressure. For that reason, hydraulic hoses are usually made of steel material.

8. Brake Booster

Brake booster serves to reduce the compressive power of the brake pedal without reducing braking power.


With the brake booster, the compressive force will multiply, and the braking process is maximized.

9. Caliper Bracket

The caliper bracket functions as a brake caliper holder to keep it stable in its place and won't move at all.

Caliper bracket

In general, the caliper bracket is always connected to the vehicle steering knuckle. However, because the shape is not possible to be connected directly, an additional component in the shape-model of a bracket is needed.

10. Disc Brake Oil Reservoir

"Disc brake oil reservoir" is tubular and serves to store fluid or extra brake fluid, usually always integrated with the master cylinder.

disc brake oil reservoir

Those are the ten components of disc brakes that you need to know as essential when you use a car with this system.

Thus when something happens related to the braking sector, at least you can know where the problem is to provide proper handling.
Ryan Daniel
Ryan Daniel Ryan Daniel is a car enthusiast. Since owning his first BMW at a young age, he has loved the automotive world even more.