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When I press the brakes in a car, there is a sort of hissing, almost compressed air sound coming from the brake pedal. What causes that? - Quora
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My brakes is making a hissing sound (like air coming free) when I brake but it isn't affecting the brakes, what could it be? Could it be a leak maybe? : r/Cartalk
Hissing Noise From Brake Pedal
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Hissing Noise under dash - brake pedal area - MBWorld.org Forums
Back of brake pedal leaking and making a hissing noise, whats the fix? (Mk5 GTI) : r/GolfGTI
noise - Hissing/air sound when applying brakes - Motor Vehicle Maintenance & Repair Stack Exchange
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Volvo S60 + Mercedes cars How to prevent the brake booster (servo) from failing 2001-2010 - YouTube
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