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Go Back   E46Fanatics > Tuning & Tech > Suspension & Braking

Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 10-14-2013, 02:56 PM   #1
E46conv325
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Hissing sound from brake

Hello all - I am getting this hissing sound almost like an air leak coming from the brake pedal/brake booster area. When I press the brake pedal it goes away but as soon as I release the pedal it comes back. I visually checked the hose that goes into the booster and it seems ok. Any thoughts on diagnosing the issue? I didn't want to assume the booster was going bad automatically. Thanks!


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Old 10-15-2013, 08:26 PM   #2
Importluv
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You have a leak in the brake booster. It simply needs to be replaced. I had the same issue as you mentioned, and it only gotten worse. I let it go on for a few months until I got fed up with the car stalling out several times a day. It disappeared as soon as I replaced the booster.
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Old 10-15-2013, 08:30 PM   #3
E46conv325
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Hissing sound from brake

Importluv - how much was the new booster? Did you buy oem from dealer or aftermarket and is there a difference between the two?


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Old 10-15-2013, 08:36 PM   #4
dmax
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Did you make sure the hose end is pushed into the booster...it's just a pressure fit...might just be loose...or perhaps you have a leak elsewhere in the vac system.

Brake booster don't fail that often here as far as I know...though I know they've failed.
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Old 10-15-2013, 10:28 PM   #5
Importluv
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My local auto supply chain store (autozon_) priced rebuilt ones, made by Cardone, for $130 with core exchange. I installed a used one, $75, in my car because money was tight for me at the time. OEM has them priced double that. I would buy a rebuilt one if I could do it over again to be honest.
It took me 7 hours to complete the replacement along with bleeding the brakes. Its easy to understand the process, just very time consuming.
Before I executed the booster replacement, I performed the carburetor cleaner test for vacuum leaks on hoses; no success with that.
The only part that's inside the cabin on the booster is the rubber boot and the steel shaft, so a loose hose is not a possible cause since he is hearing the hissing from inside the cabin when brake is not applied.

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Old 11-10-2013, 03:42 PM   #6
jmejia4
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Hissing sound from brake

^ +1. My car was doing the same, removed the booster and being curios I opened up the old one, the rubber seal around the shaft had gone "dry" and pushed out of place so it was leaking when the pedal wasn't pressed.


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Old 11-11-2013, 06:35 AM   #7
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http://forum.e46fanatics.com/showthr...+brake+booster
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