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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 09-22-2013, 05:00 PM
kaydee kaydee is offline
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Stiff brakes

I bought a 2009 335i a year ago and recently started to have a very stiff brake on start up after the car sits (ie, in mornings or evenings after work). It would only depress very slightly. See this video (apologies for the shaking...):
.

This isn't normal, right? I've taken the car into the dealership twice and they said they couldn't replicate this problem. It now happens 95% of the time so I'm not sure how this didn't happen for them.

I searched the forum and there was a lengthy discussion back a few years and there was a SIB in Nov 2007 that describes the exact problem. They've done a smoke test on the brake booster and didn't find any leaks. Any ideas?

Really appreciate the help!

Last edited by kaydee; 09-22-2013 at 05:04 PM.
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  #2  
Old 09-22-2013, 05:37 PM
anE934fun anE934fun is offline
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Quote:
Originally Posted by kaydee View Post
I bought a 2009 335i a year ago and recently started to have a very stiff brake on start up after the car sits (ie, in mornings or evenings after work). It would only depress very slightly. See this video (apologies for the shaking...):
.

This isn't normal, right? I've taken the car into the dealership twice and they said they couldn't replicate this problem. It now happens 95% of the time so I'm not sure how this didn't happen for them.

I searched the forum and there was a lengthy discussion back a few years and there was a SIB in Nov 2007 that describes the exact problem. They've done a smoke test on the brake booster and didn't find any leaks. Any ideas?

Really appreciate the help!
There was a more recent thread. Try searching again. Cliff-Notes version is that if the pedal is not stiff when the engine is running, you are okay. No obvious leaks from the smoke test is another indicator that things aren't needing repair. You have some vacuum seepage that is occurring, but the engine replenishes it once it is running.
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  #3  
Old 09-22-2013, 05:46 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by kaydee View Post
I bought a 2009 335i a year ago and recently started to have a very stiff brake on start up after the car sits (ie, in mornings or evenings after work). It would only depress very slightly. See this video (apologies for the shaking...)

This isn't normal, right? I've taken the car into the dealership twice and they said they couldn't replicate this problem. It now happens 95% of the time so I'm not sure how this didn't happen for them.

I searched the forum and there was a lengthy discussion back a few years and there was a SIB in Nov 2007 that describes the exact problem. They've done a smoke test on the brake booster and didn't find any leaks. Any ideas?

One good idea

You see? That site captures input from everywhere....
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Old 09-22-2013, 05:49 PM
anE934fun anE934fun is offline
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One good idea

You see? That site captures input from everywhere....
NSA doesn't need to vacuum up Internet activity - Google already does it..... More like NSA was just envious that Google had something that it didn't.
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Old 09-22-2013, 06:44 PM
kaydee kaydee is offline
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Facepalm. Google search fail.

Missed the newest E90 post. I still have some time left on my warranty so I'll try a new dealership to see if they can correct the vacuum leak. It's just an annoyance and there would be "off" days when the brakes are fine.

Appreciate the replies.
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Old 09-22-2013, 07:59 PM
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CALWATERBOY CALWATERBOY is offline
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NSA doesn't need to vacuum up Internet activity - Google already does it..... More like NSA was just envious that Google had something that it didn't.

My opinion: Google is a NSA contractor.
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Old 09-22-2013, 10:52 PM
anE934fun anE934fun is offline
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Originally Posted by CALWATERBOY View Post
My opinion: Google is a NSA contractor.
Doubtful about the contractor part. But you can be certain they are a supplier.
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Old 09-23-2013, 01:17 AM
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CALWATERBOY CALWATERBOY is offline
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Doubtful about the contractor part. But you can be certain they are a supplier.

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Old 09-23-2013, 05:02 AM
hondo402000 hondo402000 is online now
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most likely the check valve and grommet that goes into the brake booster needs replacing, the usual culprit for that problem
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Old 09-23-2013, 02:58 PM
fdriller9 fdriller9 is offline
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This is a known problem and there was a TSB released for this issue.

It can be one of 2 problems.

1) The check valve by the brake booster is loosing vacuum when the engine is off. The valve is cheap, like $20 if I recall correctly. Replacing it is a kinda of a pain but doable.

2) You booster is failing.
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