![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 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](https://preview.redd.it/6z6dnd7n8j141.jpg?width=640&crop=smart&auto=webp&s=d30e49f8203fac79c28c6d7d094276d3d0facb38)
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 pedal hissing: Is it always the brake booster or will a bad vacuum line cause the hiss? | Ford Mustang Forum
![Hissing sound from brakes — Ricks Free Auto Repair Advice Ricks Free Auto Repair Advice | Automotive Repair Tips and How-To Hissing sound from brakes — Ricks Free Auto Repair Advice Ricks Free Auto Repair Advice | Automotive Repair Tips and How-To](https://ricksfreeautorepairadvice.com/wp-content/uploads/2015/03/at-rest-300x285.jpg)