Q: Squealing coming from brake power booster/check valve?

asked by on

When brake pedal is depressed i hear a squealing sound coming from area of Power Brake Booster. It doesn't sound like a mechanical sound. It's more like hissing leaking noise. Like a vacuum leak.

I'm not losing any Fluids from the master cylinder. The brakes also appear to be dragging like a warped brake disc, but i had the disc replaced and machined buy a mechanic.

My car has 134000 miles.
My car has an automatic transmission.

Hello - your problem sounds like a failed vacuum or fresh air valve in the power brake booster, or possibly a ruptured diaphragm in the booster. And, you are correct that this failure will not lose brake fluid. I would recommend having a Brake Vacuum Booster Replacement Service completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Squealing coming from brake power booster/check valve?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I had the catalyst converter replaced last year. Now the Check Engine Light is on again for O2 sensor. What do I do?

You may want to have a professional inspect the catalytic converter. When the Check Engine Light comes on for this, it does not necessarily mean that the catalytic converter has failed. This may be related to many other things as...

Q: Q: Car making grinding noise

There is a good chance that what you heard was the transmission. Transmissions are very complex systems. It is very likely that the transmission will need to be overhauled or even replaced, depending on what part of the transmission has...

Q: AC belt makes squealing noise

The belt on your 2000 Plymouth Voyager is used by the engine to turn the A/C pulley along with the water pump, power steering pump, and other accessories. Any one of these items could be the cause of the belt...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.