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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Overnight loss of vacuum - Brake Booster leak?



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      08-11-2011, 10:12 AM   #1
Alex D
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Overnight loss of vacuum - Brake Booster leak?

I have my 335 in for service at the BMW dealer and it seems that since I got it back the brake booster loses vacuum overnight. When I jump in in the morning ther is no vaccum to boost the brake pedal before I start the car.

That was quite scary initially when it happened first and is a safety issue because when I park on an incline the car will roll away as soon as I press the clutch or you have to stand on teh pedal with both feet to affect any braking without the vacuum being there.

Is this common on the 335i? Has anyone had this issue?
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      08-11-2011, 10:15 AM   #2
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What was it at the dealer for? Sounds like your check valve might be jacked up?
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      08-11-2011, 10:16 AM   #3
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Maybe I'm misunderstanding your question. But there is no power boost for brakes (or steering, for that matter) unless the motor is running - this applies to all cars with power steering, not just BMWs So how can you expect power brakes before starting the car?

Tom
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      08-11-2011, 10:21 AM   #4
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Quote:
Originally Posted by Tom K. View Post
Maybe I'm misunderstanding your question. But there is no power boost for brakes (or steering, for that matter) unless the motor is running - this applies to all cars with power steering, not just BMWs So how can you expect power brakes before starting the car?

Tom
The brake booster retains it's vacuum when the engine is shut off, allowing last ditch assistance with braking if the engine dies; the vacuum is managed by a checkvalve that keeps air from entering, but allows the engine to suck air out. If this check valve is bad then air would fill the brake booster when the engine is shut off.
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      08-11-2011, 10:30 AM   #5
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Quote:
Originally Posted by georgelb View Post
The brake booster retains it's vacuum when the engine is shut off, allowing last ditch assistance with braking if the engine dies; the vacuum is managed by a checkvalve that keeps air from entering, but allows the engine to suck air out. If this check valve is bad then air would fill the brake booster when the engine is shut off.
True - there should be enough residual vacuum to operate the brakes 1 or 2 times...
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      08-11-2011, 10:36 AM   #6
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mine doesn't hold this vacuum 8 times out of 10. what do i need to replace to get that seal again?
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      08-11-2011, 10:39 AM   #7
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Quote:
Originally Posted by 335okc View Post
mine doesn't hold this vacuum 8 times out of 10. what do i need to replace to get that seal again?
Same here... 8/10 times I lose vacuum after leaving car parked for 12+ hours
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      08-11-2011, 11:12 AM   #8
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The car was in for a general service, state inspection and a brake fluid change was due and done per the service indicators in the DIC.

Differnt from naturally aspirated cars the 335i system has two extra vacuum reservoirs in the front left corner of the engine compartment. The brake booster in any car also should hold vaccum for at least four to five brake actuations because brakes do not work well at all without vacuum in the system. Try it out. Jump in your car without the engine started and apply the brake pedal four five times. You'll notice the vacuum getting used up and applying the brakes becomes very hard.

This ahd never happened to my car ... So I took it into the dealer 30 minutes ago to check it out.
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      08-11-2011, 11:15 AM   #9
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Quote:
Originally Posted by topsaul View Post
Same here... 8/10 times I lose vacuum after leaving car parked for 12+ hours
This is flat out unsafe! When i called the dealer about this they ahd me come in immendiately. If you are parked on an incline and have a manual trans as I do when you want to start the car and push teh clutch while also applying the brake to hold teh car, the car will to start roll away and you'll have a hard time stopping right away it if you don't expect this to occur. I quickly janked the parking brake to hold teh car when it happened again this morning.
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      08-11-2011, 11:30 AM   #10
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Old problem. They'll fix it. Theres a notice out for it from a couple years ago.
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      08-11-2011, 12:01 PM   #11
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Quote:
Originally Posted by JayKay335i View Post
Old problem. They'll fix it. Theres a notice out for it from a couple years ago.
Have a SIB number or link ???
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      08-11-2011, 12:28 PM   #12
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There is a one valve online that retains vacuum when the car is off, mine has been replaced twice, which is the normal fix, now it is doing it again and the thing it need an entire new vacuum booster!
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      08-11-2011, 12:49 PM   #13
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Do a search, there are plenty of threads regarding this issue.

anyway, here is the bulletin, take it to the dealer, they should take care of it for you:


SI B34 06 07
Brakes November 2007
Technical Service

SUBJECT
Additional Effort Required to Press Brake Pedal Prior to Engine Initial Start
MODEL
E90, E91, E92, E93 (3 Series) produced up to 9/07
SITUATION
A customer may report increased brake pedal effort prior to engine start. This situation can occur if the vehicle sits for extended periods of time. Although the brake pedal can be depressed, the customer may note a change in pedal feel.
CAUSE
The vacuum check valve, fitted at the brake booster, may leak due to component tolerances within the valve assembly.
CORRECTION
Replace the vacuum valve and hose assembly for the brake booster; refer to Repair Instruction RA 34 33 051.
PARTS INFORMATION
Part Number
Description
Quantity
34 33 7 577 336
Vacuum Pipe
1
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Please refer to the latest KSD for all applicable labor operations and allowances.
If the appropriate labor operation is not contained in KSD, then a work time labor operation should be used.
Defect Code
34 33 00 14 00
[ Copyright 2007 BMW of North America, LLC ]
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      08-11-2011, 01:12 PM   #14
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Thanks man!! I actually searched and googled the symptoms but never came up with anything here or on the WWW
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      08-11-2011, 01:30 PM   #15
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That's strange because my car was built 4/08 and i have this exact problem.
I took it in one time (along with maintenance and some other things to get done) and the next morning i had the same problem. Another person on this forum replaced theirs 3+ times and it still had the same problem; He was complaining that his wife had a hard time starting the car (or something along those lines).
I've gotten used to it, but next time i'm at the dealership, i'll get it replaced and it'll probably still lose pressure
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      08-11-2011, 03:06 PM   #16
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Interestingly I just got a call from my SA saying this SIB 34 06 07
does ONLY apply to cars with automatic transmission, not manual trans like mine. Sounds super fishy.
I googled and googled, but could not find the original SIB as a pdf

Does anyone have a link or original pdf file of this particular SIB. I can't believe its different for an auto car from a manual trans car ..
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      08-12-2011, 10:31 PM   #17
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My car is out of warranty, so what did they said has to be replaced? Im hoping to do it myself. Plus ive heard of this issue a few times in here and nobody ever get a permanent fix, so i just let mine be.
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      08-13-2011, 02:19 PM   #18
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So since the SA said that since the SIB above does not apply to manual trans cars he would need to keep the car overnight to reproduce the issue but I couldn't leave the car. We left the ticket open to come back but I bet if I replace the vacuum pipe with the included check valve it will fix the issue. I looked the pipe up on Real OEM and its $36 incl. shipping at bavauto. Seems easy to replace too.
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      08-13-2011, 04:31 PM   #19
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Did you happen to jot down the part number?
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      08-13-2011, 06:13 PM   #20
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Quote:
Originally Posted by 335okc View Post
Did you happen to jot down the part number?
Are you familiar with RealOEM.com ??

http://www.realoem.com/bmw/showparts...56&hg=34&fg=27
p/n 11667570497
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      08-13-2011, 06:33 PM   #21
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I'm pretty familiar with the site, i just have a hard time finding the parts sometimes.are you/they just going to replace all 3 pipes (8,9,10) and brake booster seal (5) ?
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      08-13-2011, 07:38 PM   #22
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Quote:
Originally Posted by Alex D View Post
This is flat out unsafe! When i called the dealer about this they ahd me come in immendiately. If you are parked on an incline and have a manual trans as I do when you want to start the car and push teh clutch while also applying the brake to hold teh car, the car will to start roll away and you'll have a hard time stopping right away it if you don't expect this to occur. I quickly janked the parking brake to hold teh car when it happened again this morning.
Regardless if the power brakes don't work, you can always jab the pedal, and the brakes still function. You won't get gradual braking feel, it's more of an on/off, but it's a reduntant safety mechanism.
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