Question about 2001 Volvo V70

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Noise i had 2 different noises in regards to my S80 02 Volvo. one was noise that is under the hood on the front drivers side, i would first hear a loud piercing sound and then a noise that sounded like the car was leveling or some sort of a compressor. this has gone on for months and the dealer can't find the problem. next when i released my foot from the brake i heard a sound that sounded like air escaping. they installed a new boster brake and that nosie went away but i still have the original noise.

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Some models have a vacuum pump that operates at times. I believe it is to help provide more vacuum for the power assist brakes.

Does it happen when you are stopped, and you depress the brake pedal a few times? Does it happen when the engine is cold, or warmed up?

Bret
RepairPal.com

Posted on Nov 23, 2008

  • wirelessbill Sep 07, 2010

    Bret
    I have the same poboem- sounds ike air escaping.behind the brake pedal - just start yesterday

    bill@crventures.com

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