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What is a brake booster?

What is a brake booster?

The brake booster is an essential part of your car's braking system.  It plays a crucial role in your car's braking system. But have you ever wondered exactly what it is and how it works? We explain it all in detail.

What is a brake booster?

The brake booster is one of the most important components of the braking system. It is located next to the master cylinder, brake pads and rotors. It consists of several components, including the master cylinder, brake fluid reservoir, diaphragm, and check valve. Each of these components plays an important role in the operation of the booster. It is connected to the brake pedal and helps facilitate braking when the driver wants to slow down.

Brake booster types

There are several types of brake boosters.

Vacuum Brake Booster

The most common type is the vacuum booster. It uses engine vacuum in naturally aspirated gasoline engines to increase brake pedal pressure.

Hydraulic Brake Booster

Instead of relying on vacuum, this booster uses direct hydraulic pressure generated by the power steering pump.

As an example, consider the mechanical brake boosters found on older vehicles. In this case, the vehicle's power was the auxiliary energy source. This type of brake booster is increasingly being abandoned in favor of other models, such as the vacuum brake booster.

The most common type, the vacuum booster, consists of 3 parts:

  • A pump;
  • A control unit;
  • A pneumatic body.

Levers and rods connect the booster to the pedals. In this system, braking efficiency is increased tenfold by the vacuum action of the suction lines and the motor.

How does a brake booster work?

A brake booster is a device that helps the driver apply the brakes with less effort. It uses vacuum pressure to multiply the force of the driver's foot on the pedal.

It does this by using the vacuum pressure from the engine to amplify that force. So when the brake pedal is depressed, a valve opens, allowing the vacuum to enter the cylinder and push the diaphragm, amplifying the braking force.

The booster has a diaphragm connected to a rod that goes through the firewall and attaches to the pedal. When you depress the pedal, the diaphragm pushes fluid into the master cylinder, multiplying the force so your brakes can apply more pressure.

Why is the booster important?

The brake booster plays an important role in vehicle safety. By reducing the force needed to stop the car, it improves the driver's ability to react and reduces the likelihood of a road accident. One of the most important parts of a vehicle is its braking system, as a properly functioning system can mean the difference between avoiding an accident and being involved in one.

In addition to safety, they also affect vehicle performance. A properly functioning booster allows for more effective braking, which improves overall vehicle performance.

Brake booster life

A booster should last at least 150,000 km. There's no reason a booster shouldn't last many more miles in a well-maintained vehicle.

If you notice any symptoms of brake booster failure, have your car checked by a mechanic as soon as possible. This is the only way to know if your brake booster needs to be repaired or replaced, as there is no specific life expectancy for this part.

How much does it cost to replace a brake booster?

The price to replace a brake booster varies greatly depending on the model of your vehicle and the type of brake booster being used. On average, you can expect to pay $100 for the part, plus the cost of labor, which will vary depending on the complexity of the job.

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