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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
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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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Can the brake booster cause the brake pedal to go to the floor? Also when the engine is turned on, a hissing noise comes from the booster especially when the brake pedal
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