Skip the auto shop - Our mechanics make house calls

Q: Hissing noise when brake pedal depressed.

asked by on

Hissing sound when brake pedal is depressed. Fluid reservoir is full and there is no wetness inside under or near the pedal or carpet (I've even pulled the carpet up to look) so it doesn't look like I'm leaking fluid into the booster. The pedal is not hard to depress, and there's no smell or anything else. Just the hissing sound.

My car has 200000 miles.
My car has an automatic transmission.

A: ...

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Brakes

Hello. You could have one issue or multiple issues that together are causing this fault. Brakes are of course very critical and in the event that the problem is due to failed, or failing, seals in the master cylinder (underhood),...

Q: Needs to pass smog check..

If the check engine light is only coming on when your on the freeway it might be a problem that the computer is only recognizing at cruising speeds. Your best bet would be to have a certified mechanic read the...

Q: Transmission won't shift into second gear

This is often a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.