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Q:

when I step on the brakes it sounds like there is air coming out what does that on 2001 Volvo V70 XC

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it happens everytime I get in the car and back out to the main rd but after driving for about 5 mins the sound goes away
(2) Answers
THIS IS CAUSED BY THE BRAKE BOOSTER HAVING AN INTERNAL DIAPHRAM VACUME LEAK. CAUSING BRAKE BOOSTER VACUME PRESSURE TO ESCAPE WITCH CAN BE HEARD JUST OBOVE BRAKE PEDAL. .
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