Brake pedal sound

volvo
s60

#1

When I hit the brake pedal on my 2002 Volvo S-60, it sounds like a balloon is being deflated somewhere behind the dashboard. Any thoughts? Does this require immediate attention, or is it safe ti simply live with the sound?


#2

The noise might be caused from the vacuum brake booster check valve or from a leak in the rubber diaphram within the brake booster. When it comes to the brake system, any unusual noises should be checked out for safety’s sake.

Tester


#3

I agree. This sound is alerting you to a possible brake problem. Don’t ignore it.


#4

A slight “whoosh” sound while you are moving the brake pedal is normal. If the some continues while you are holding the pedal (but not moving it), then you have a vacuum booster problem.