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10 Complete Components of Car Brake Master and Their Functions

10 April 2025
10 Komponen Master Rem Mobil dan Fungsinya Terlengkap

Talking about car braking systems, it cannot be separated from the function of the car's master brake. This component plays a significant role in the performance of the braking system in reducing speed. Considering its important function in the braking system, it turns out that this component has other components within it. To satisfy your curiosity, let’s learn about some components of the car's master brake along with their functions.

Types of Components in the Car Master Brake and Their Functions

The following will explain in detail the components within the car's master brake, complete with their functions.

1. Master Cylinder Body

As the name suggests, this component can be considered the housing for several components of the car's master brake such as the piston, reservoir tank, and seal. These components will work within the master cylinder body. As a result, hydraulic pressure can be generated by these components by converting mechanical movement.

2. Reservoir Tank

This car master brake component functions as a reservoir for brake fluid in the car. The brake fluid will later be used to push the piston towards the caliper. This condition will cause the brake disc to be clamped by the brake pads.

Read Also: How to Detect a Leaking Master Brake

3. Diaphragm

This component serves as a protector for the brake fluid to prevent it from being directly contaminated by outside air. It can also be referred to as a cover for the reservoir component so that the master brake can be protected from corrosion. 

4. Level Sensor

This master brake component functions as a signal giver when the brake fluid capacity starts to deplete or run out. If the amount of brake fluid begins to diminish, signs will appear such as the brake warning light turning on, brake fluid dripping on the floor, and the brakes becoming ineffective when going down a slope.

5. Inlet Port

This master brake component serves as the entry point or filling hole for brake fluid coming from the reservoir tank. The fluid will then move to the pressure chamber.

6. Outlet Port

The outlet port is the opposite of the inlet port. This master brake component functions as the exit point or outlet hole for brake fluid. Later, the brake fluid from the pressure chamber will be channeled to the caliper piston or wheel cylinder. 

7. Return Port

This component plays an important role in the risk of brake fluid leakage. If this component functions well, the risk of brake fluid leakage can be prevented. This component serves to close the valve part of the pressure chamber, allowing the brake fluid to return to the reservoir tank.

Read Also: How to Properly Replace the Car Master Brake Seal

8. Primary Piston

As the name suggests, the primary piston is the main piston of the car's master brake. This component is responsible for compressing the brake fluid within the master brake.

The primary piston channel is located at the front wheels of the car. For FR type vehicles, conventional pipes are usually used as the primary piston channel. Meanwhile, diagonal pipe channels are typically used by FF type vehicles. 

9. Secondary Piston

The secondary piston has a channel located at the rear wheels of the car. The function of this component is the same as that of the primary piston.

10. Return Spring

This component functions to return the primary and secondary pistons to their original position when the brake pedal is released. 

Thus, these are some components found in the car's master brake. To ensure that the braking system functions well and your safety is always maintained, it is advisable to regularly check and maintain the car's braking system.

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