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Suspension & Braking Forum by BimmerWorld
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Old 07-21-2016, 03:43 PM   #1
Tiger96
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Brake pedal is soft

So for a while now when i press the brake pedal the first inch or so of the pedal is very soft, the rest being hard. The car brakes normally i just have to press the pedal harder. It didn't used to be like that, i would just barely touch the pedal and the car would brake.

Today i asked my brother to press the brake pedal with the engine turned off and the hood opened and i could hear air being blew out in the engine bay when he pressed the pedal.

What do you guys advise me to do? What is the problem?

Thanks
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Old 07-21-2016, 03:49 PM   #2
Spannerhead
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Where was the air coming from in the engine bay? That'd be the first place to check. Sounds like you may have a hole in your brake booster line or a faulty booster itself.

Beyond that, bleed your brakes. You already have an assistant (getting one is half the battle ) so the two-man method is the way to go.
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Old 07-21-2016, 03:52 PM   #3
Tiger96
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Quote:
Originally Posted by Spannerhead View Post
Where was the air coming from in the engine bay? That'd be the first place to check. Sounds like you may have a hole in your brake booster line or a faulty booster itself.

Beyond that, bleed your brakes. You already have an assistant (getting one is half the battle ) so the two-man method is the way to go.
I think it was coming from somewhere below the brake fluid reservoir, but deeper.

How can i properly check if its the brake booster line?

Thanks for the answer.
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Old 07-21-2016, 03:58 PM   #4
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Not sure how it is on your M47, but on the M54s the brake booster hose is one of the most easily accessible in the engine bay.

#6 here:



http://bmwfans.info/parts-catalog/E4..._depression_2/
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Old 07-21-2016, 04:04 PM   #5
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Thank you for the help, i will take a look tomorrow.
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