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Brake Servo Replacement
Typical Cost: Medium
Mobile Repair? Yes
Typical Lead Time: 24 - 48 hours depending on part availability
What does a brake servo / booster do?
The brake servo, or to give it its correct name, a brake power booster, is used to augment the effort applied to the brake pedal by the driver to increase the force of the brake pads and shoes against the brake discs and/or brake drums.
How does a brake servo work and what are the components?
When the brake pedal is pushed, this movement activates a spring, which in turn opens an air valve allowing air at atmospheric pressure to enter into the chamber. There are two chambers, one at atmospheric pressure and one that has a vacuum. So when the pedal is applied, the diaphragm between two two moves towards the vacuum chamber and exerts an additional force to push against the brake master cylinder piston
Inside the brake servo there are various valves, springs, seals and diaphragms. There are no serviceable components in a brake servo as it is a sealed unit and as such is replaced as a whole. Tampering with the unit can have a detrimental outcome of its ability to work correctly.
Typical symptoms that require a brake servo to be replaced.
In most cases there could be more than one symptom. If you feel that your brakes are not performing as they should, please book an inspection with immediate effect and do not drive the vehicle.
- You may find that you are requiring to press the brake pedal harder in order to slow the vehicle
- You may hear air escaping from the unit when the brake pedal is depressed.
What happens during a brake servo replacement?
Changing a brake servo is a routine repair for all mechanics and can be done both kerbside as well as in the workshop, providing it is safe to do so.
Whilst there are variations between manufacturers, the basics are pretty similar.
The mechanic will;
- Inspect the brake system.
- If necessary, replace the brake servo.
- Check the brake fluid level.
- If necessary, bleed the brake fluid system.
- Inspect the brake system again and if deemed safe, test drive the car.
What does this repair 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
What to search for on the ClickMechanic site?
Brake servo replacement
Associated repairs
Brake master cylinder replacement
Brake caliper replacement
Brake hose replacement
Brake pipe replacement
Brake fluid change
Brake shoes replacement
Brake drums replacement
Brake pads replacement
Brake discs and pads replacement
Brake shoes replacement
How much does it cost to have a brake servo replaced?
The cost of a brake servo replacement depends on your car and what parts your car's manufacturer recommends.
Find out what you could save by visiting ClickMechanic
https://www.clickmechanic.com/bookings/car
FAQ’s
Can I supply my own parts?
No, we will not fit customer supplied parts unless they are a brand new item, purchased from a dealership with the receipt as proof of purchase. There is no flexibility over this due to insurance and warranty issues.
What happens if the mechanic finds that the brake servo doesn’t require changing and the problem is due to another issue?
In this scenario, the mechanic will provide a no obligation quote for the correct repair. Should you accept this, the mechanic can alter the booking accordingly. If you decide not to go ahead with the alternative repair, the mechanic can change the booking to a call out and diagnostic booking and charge according to the time spent with the vehicle and call out.