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Booster

Hi there, thanks for writing in. I'd be happy to provide my insight. There is a possibility that they may have overfilled the brake reservoir with brake fluid. Start by checking that it has the proper amount. Secondly, it is...

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...

Hi there - the brake booster on your Jetta uses an engine-driven vacuum pump (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-brake-booster-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...

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...

Hi there - yes, I believe you are correct. Sounds like the diaphragm in the booster has ruptured (https://www.yourmechanic.com/question/-why-is-newly-replaced-brake-booster-making-a-whistling-noise-and-brake-pedal-staying-depressed-by-chris), and is leaking air (to the engine), resulting in little or no brake pedal effort assist. I recommend a brake booster...

Hi - from your description of symptoms, it sounds like the brake booster has an air leak (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-hydraulic-brake-booster), or possibly the hose to the brake booster has a leak. The brake booster uses engine vacuum for braking assist. If the...

This may suggest your brake booster is failing. The brake booster (https://www.yourmechanic.com/services/vacuum-brake-booster-check-valve-replacement) 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...

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...

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...

Hello, it sounds like you have a bad run with parts. That booster is leaking internally. It has nothing to do with installation. You need to get another booster, may be a different brand. Make sure your vacuum hose...

Hi there - I believe your master cylinder failure is being misdiagnosed. I believe the problem is with the brake booster (https://www.yourmechanic.com/article/how-to-replace-a-power-brake-booster) - one of the control valves (vacuum?) to be specific. If this valve malfunctions, it could allow much...

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...

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...

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...

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...

Hi there. The wastegate actuator is not functioning correctly or the boost sensor (https://www.yourmechanic.com/services/barometric-sensor-replacement) is not working making the turbo boost properly. Check the wastegate actuator hose (https://www.yourmechanic.com/services/wastegate-hose-replacement) and see if its broken and listen for leaks when you drive...

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...

It sounds like the brake booster (https://www.yourmechanic.com/services/brake-booster-vacuum-sensor-replacement) 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...

It seems that your brake booster (https://www.yourmechanic.com/services/vacuum-booster-replacement) 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...

Hello, the brake booster assembly will have to be replaced. There are rubber diaphragms that degrade from seafoam. The hissing sound is a vacuum leak with the booster. I recommend having a certified YourMechanic technician come to your location to...