Brakes hissing?
 

I hear a hissing that seems to come from the driverside door or perhaps within the speaker, but only when I take my foot off the brake (and it doesnt happen ALL the time). Any idea what this could be? Loss of brake pressure?

RE: Brakes hissing?
 

Brake booster is bad.
It is leaking from the Diaphram internally.

You will need to replace it.

RE: Brakes hissing?
 

What are the potential problems if not replaced immediately?

RE: Brakes hissing?
 

Check engine light.

If it goes out all the way it will be hard to stop.
To see how hard go to a secluded parking lot. Turn the car off while rolling and try to stop the car.Hit the pedal once to twice till it gets hard then try to stop.

RE: Brakes hissing?
 

I haven't found a single website that has OEM Brake Boosters for my car...Any price range you can give me from a dealer/mechanic?

RE: Brakes hissing?
 

About $400.00 for the Parts and about 1 1/2 to 2 hours labor.[:@](OUCH)