Hi there,

I just notice this recently, sometime when i step on the brakes brifely and let go (like in traffic jam). there's a faint hissing noise coming from my brake pedal, but if i step on the brake pedal the noise stops until i let go again....on the other hand, if i step on the pedal really hard then let go, the noise stops completely. sounds like somthing leaking?? and there's no noticeble different in braking performance and distance.... weird[&:]

FYI: I got my brakes serviced in Nov last year: new brake pads all around, drain, fill and bleed system with dot 4 fluid.

Any help will be greatly appreciated

Dan

 

The diaphram in the brake booster is bad.You will need to have the brake booster replaced.

 

brake booster... is that the same as brake cylinder??? how much $$$ is that?? can i do it myself??

As of this morning, there's no noise coming from the pedal, and i'm stuck in traffic every morning... will this eventually affect my brake performance??

 

The brake booster and master cylinder are diffrent things.If you have patiance you can do it.It is a pain you have to disconnect the battery and move the front fuse box.

 

Im at volvo right now and i think the service guy said it be around 750$ for it.....