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Brake Pedal sounds like an air pump! - Skoda Octavia Mk III (2013 - 2020) - BRISKODA
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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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noise - Hissing/air sound when applying brakes - Motor Vehicle Maintenance & Repair Stack Exchange
Symptoms of a Bad or Failing Power Brake Booster | YourMechanic Advice
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
Brake Booster Hiss | RMS Motoring Forum
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air leaking noise coming from brake pedal - CrossfireForum - The Chrysler Crossfire and SRT6 Resource