Brake Servo repair & replacement made easy

How does a brake servo work?

The brake servo, also known as a brake power booster, is an important part of your car's braking system that makes it easier for you to stop the vehicle. When you press the brake pedal, the brake servo helps by using air pressure to increase the force you apply to the pedal. This extra power helps push the brake pads or shoes more firmly against the brake discs or drums, which is what slows down or stops your car.

Here’s how it works: When you press the brake pedal, it opens a valve that allows air to flow into the brake servo. Inside the brake servo, there are two chambers – one with regular air pressure and the other with a vacuum (a type of low pressure). When you press the pedal, the brake servo’s diaphragm moves, using the vacuum to give an extra push to the brake master cylinder. This extra boost makes it easier to apply enough force to stop your car without needing to push the pedal too hard.

If the brake servo stops working, it can cause problems with your brakes. You might notice that your car becomes much harder to stop, which can be dangerous.

What does a brake servo replacement job involve?

The process for brake servo replacement involves several important steps to ensure your vehicle's braking system is functioning safely:

• The mechanic will first inspect the entire brake system to identify any issues, including the brake servo.
• If the brake servo is found to be faulty, the mechanic will replace it with a new one.
• The brake fluid level will then be checked to make sure it's at the proper level for safe operation.
• If necessary, the mechanic will bleed the brake fluid system to remove any air bubbles, ensuring the brakes work effectively.
• Finally, the mechanic will reinspect the entire brake system. If everything looks good, they will test drive the vehicle to ensure the brakes are working properly and safely.

How do I know whether I need a brake servo repair or replacement?

Knowing whether your brake servo is failing can help you avoid brake-related issues before they become serious. Here are some key symptoms to watch for:

• If you find yourself needing to press the brake pedal harder than usual to slow down or stop, it may be a sign that the brake servo isn't working properly, and it might need replacing.

• If you hear air escaping when you press the brake pedal, it could indicate a leak in the brake servo or its vacuum system. This is often a sign of damage and requires attention.

• If the brake pedal feels soft or "spongy", it might mean the brake servo isn't providing enough assistance. This can make it harder to stop the car efficiently.

• If the brakes feel less responsive than normal or take longer to stop the car, it could be a sign that the brake servo isn’t boosting the braking force as it should.

If you notice any of these symptoms while driving, it's important to get your brake servo checked immediately.

Can a brake servo be repaired?

Due to the brake servo being made up of several important parts, including valves, springs, seals, and diaphragms in a sealed unit, there are no individual parts that can be repaired. If something goes wrong, the whole brake servo needs to be replaced. This is why replacing the brake servo is usually the best and most practical solution.
How much does a brake servo replacement cost?
On average, a brake servo replacement costs around £320, though prices can vary between £260 and £375. The exact cost will depend on your car's make and model, as well as the specific parts recommended by the manufacturer. Try our free price estimator to find your brake servo replacement price.

What does brake servo restricted mean?

This warning usually means that the brake servo (or brake booster) isn’t receiving enough vacuum pressure, which can reduce braking assistance. As a result, the brake pedal may feel harder to press, and overall braking performance may be affected. It can be caused by a faulty vacuum pump, a blocked line or a leak in the servo or hose.

Most commonly this error occurs due to a faulty pressure sensor and is being reported more often in Audi vehicles. Get your vehicle inspected as soon as possible. If you’re finding the brakes hard to use or unresponsive, it’s safest to avoid driving until it’s repaired, especially for longer journeys or motorway driving.

What does a ClickMechanic brake servo replacement quote cover?

Unless otherwise stated, the quote for your brake servo to be replaced will cover;

• The cost of the brake servo and brake fluid if required
• Coming to you
• Fitting of the parts
• Disposal of the old parts (unless you request to keep them)
• VAT (if applicable)
• 12 months parts and labour warranty

Can the brake servo be replaced by a mobile mechanic?

Yes, the brake servo can be replaced by a mobile mechanic. While it’s a more complex job, skilled mechanics have the tools and expertise to handle the replacement at your location, as long as it’s safe. If the vehicle is drivable, there is no collection and delivery fee for bringing the vehicle to the garage.