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Booster

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How to Replace a Vacuum Brake Booster
The vacuum brake booster generates extra force for car brakes. If your car is hard to stop or wants to shut off, replace your brake booster.
Symptoms of a Bad or Failing Vacuum Brake Booster Check Valve
Common signs of a faulty vacuum brake booster check valve include the brake pedal being difficult to engage, feeling spongy, or not working at all.
Symptoms of a Bad or Failing Hydraulic Brake Booster
Common signs include less braking power, a brake pedal that is hard to press, and fluid leaks.
How to Buy and Install a Booster Seat
Booster seats are important safety features for young children. When a child has outgrown their child restraint system, but is not yet big enough to safely fit the adult-sized lap...
How to Replace a Power Brake Booster
Replacing a power brake booster can be challenging, as it requires several steps and the proper tools to do so.
How to Replace a Hydro-Boost Brake Booster
Diesel engines require a brake booster that is different from vehicles with engine vacuum. The hydro-boost unit uses power steering fluid pressure.

Related questions

Question
I am having a turbo sensor issue and I may have wiring issues also on my 2006 Volvo S60
Hello. If you suspect that the sensor was not replaced then that can be why the light is coming on. I would need to know what code is coming from the computer for it to be able to tell better...
Question
Nissan NV 400 hissing noise from servo when you push brake pedal lightly 2013 Nissan NV 1500
Hi there - yes, I believe you are correct. Sounds like the diaphragm in the booster has ruptured, and is leaking air (to the engine), resulting in little or no brake pedal effort assist. I recommend a brake booster replacement](https://www.yourmechanic.com/services/hydraulic-brake-booster-replacement)...
Question
2006 Audi brake pedal hard replaced booster with no results
To begin with the booster needs a vacuum source. You said you replaced the line, but there is a check valve in the line, it is probably installed at the booster end of the line. It looks like just an...
Question
Master Booster, 2001 Lincoln Continental
Hello - these symptoms do indeed suggest that the brake power booster has failed. A hissing sound as you describe indicates that the rubber diaphragm in the booster has ruptured, reducing brake power assist, and leaking air to the engine...
Question
Brake booster replacement for 2005 Volkswagen Phaeton.
Hi there. You will have to remove the master cylinder and all of the engine components that are in the way of the brake booster. Then the bolts on the inside of the cab will need to be removed to...
Question
Brakes not working and brake booster possible failure causing the engine to stall.
Hi there. If the engine tries to stall out when the brakes are applied, then look at the brake booster for any external damage. If there is no damage to be seen, then the diaphragm inside the brake booster is...
Question
No lights or start after changing brake booster and switch on a 97 Silverado.
Hello. You need to start by checking to make sure that you did not pinch any of the wires that run along the firewall. If you did, then they will need to be repaired. I would also check the battery....
Question
Sometimes at very low speeds the brake pedal becomes hard and cannot be pressed.
It seems that your brake booster is not working well at low speeds. In this case, when the engine is not able to provide proper vacuum, the brake pedal gets hard. Try to press the brake pedal when the engine...
Question
Brakes issue with the booster
Hi and thanks for contacting YourMechanic. Check to see what issues you are encountering. If you had to replace the brake booster, then you are implying that the brake pedal is hard. If you have replaced the brake booster and...
Question
My turbo will sometimes work and sometimes will not work.
Hi there. The wastegate actuator is not functioning correctly or the boost sensor is not working making the turbo boost properly. Check the wastegate actuator hose and see if its broken and listen for leaks when you drive the vehicle....
Question
The brake pedal is low and hard to press, and my car does not brake well
It sounds like the brake booster is failing. The hissing sound you heard was air leaking through either a vacuum or vent valve in the brake booster itself. The valve failure prevents the booster from generating brake boost, making the...
Question
Problem of irregular idle anytime I apply the brakes, it quits Peugeot 307
Hi - from your description of symptoms, it sounds like the brake booster has an air leak, or possibly the hose to the brake booster has a leak. The brake booster uses engine vacuum for braking assist. If the booster...
Question
Brakes still going to floor
This may suggest your brake booster is failing. The brake booster is a mechanism that uses vacuum pressure to take the force being applied to the brake pedal and amplify it. If the booster is bad, then the full amount...
Question
Brakes hard to push or stuck in park.
Hi there. Check the parking brake lever and cable. As the vehicle was on a hill and the parking brake was set, the cable could have gotten stuck or the parking brake assembly in the rear brakes could have failed...
Question
Hissing noise when brake pedal depressed.
Hello, the hissing sound is an internal vacuum leak with in the brake booster. The booster uses vacuum to assist with the brake pedal apply. You will need to replace the booster. If you'd like, a certified Your Mechanic...
Question
I am replacing my power brakes booster and need some advice about removing the power unit from the bell crank.
Hi there. When removing the brake booster from a vehicle, you will need to remove the master cylinder and cap off the hydraulic lines. Then go in the cab and remove the pin from the bell crank and unbolt the...
Question
I know my truck is a Sierra 2500, my question is can you interchange a 1978 GMC trucks brake booster with my 1997 GMC truck?
Hi there. The best thing to do is remove both brake boosters from the 1997 and the 1978 truck and look at them. As the years went on, then design of the brake boosters changed a little bit. You will...
Question
Can brake problem cause engine problem? 2006 VW Jetta
Hi there - the brake booster on your Jetta uses an engine-driven vacuum pump - rather than vacuum from the engine intake system and a vacuum booster cylinder as many cars have historically used. It sounds like your mechanic is...
Question
Breaks don't work without a lot of pressure, and is puttering when it is on
If unusual effort is required to depress the brake pedal, to get the vehicle to stop, that is often due to a fault in the brake booster or the vacuum supply and check valve in the booster circuit. If you...
Question
hard pedal, no brake action or fluid with engine on or off.
If the brake system was working before and now the brake pedal is hard and the front calipers are not moving, then the brake booster has failed (which is the hissing sound that you are hearing) and there seems to...

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