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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Vacuum Leak?



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      12-11-2007, 11:30 AM   #1
LambOfGod
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Smile Vacuum Leak?

Hey Guys,

Something I've noticed recently is that I have to push down harder on the brake pedal when starting my car after is sits a few hours or more. Seems more difficult to actuate the brake switch. Do any of you think I have a vacuum leak?

BTW I took the car in for a new fuel pump last month and removed the Proceed and re-connected the vacuum solenoid lines. Maybe there is a leak that I created during the process.

What are your thoughts?
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      12-11-2007, 11:56 AM   #2
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You have a bad vacuum valve and hose assembly for brake booster.
take your car in for service - its a known problem
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      12-11-2007, 11:58 AM   #3
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Originally Posted by MBMWTECH View Post
You have a bad vacuum valve and hose assembly for brake booster.
take your car in for service - its a known problem
Why is it gone after removing the PROcede ?
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      12-11-2007, 12:04 PM   #4
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Why is it gone after removing the PROcede ?
problem can be sporatic - it seems to be the valve is sticking -

-I had the same problem on my e90 330 before I got the 335
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      12-11-2007, 12:08 PM   #5
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Thank you, will bring the car for service.

- Eugen
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      12-11-2007, 12:20 PM   #6
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Are you having the same proble Eugen?
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      12-11-2007, 12:21 PM   #7
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Are you having the same proble Eugen?
Yes
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      12-11-2007, 01:01 PM   #8
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i have the same problem after the car sits for more than a day in cold weather...pretty normal i guess but the cat still starts but just have to press the brake pedal a little harder
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      12-11-2007, 02:00 PM   #9
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Heres a copy of the bulletin - But shhhhh. you didnt get this from me

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
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      12-11-2007, 02:21 PM   #10
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Thanks !

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      12-11-2007, 02:34 PM   #11
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Quote:
Originally Posted by e.n335 View Post
Thanks !


NO PROBLEM -
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      12-11-2007, 02:36 PM   #12
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I actually think I have this problem. The brake pedal feels really hard before I start the car when I go to depress it to hit the start engine button. Is this normal or is this what the bulletin is describing?
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      12-11-2007, 02:37 PM   #13
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Quote:
Originally Posted by MBMWTECH View Post
Heres a copy of the bulletin - But shhhhh. you didnt get this from me

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
Thanks bro!
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      12-11-2007, 03:03 PM   #14
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Oh, I have this problem too...I always thought I was just being too gentle on the pedal, but I could have sworn when I first got my car it didn't take much pedal pressure to get it to start. I've been using much more pedal recently to start the car, because I hate hitting the button and have nothing happen.

Thanks for the info
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      12-11-2007, 03:11 PM   #15
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Quote:
Originally Posted by orientblue3 View Post
I actually think I have this problem. The brake pedal feels really hard before I start the car when I go to depress it to hit the start engine button. Is this normal or is this what the bulletin is describing?
YES - GO GET IT FIXED
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      12-11-2007, 03:27 PM   #16
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So nice to have a BMW tech on here. Thanks for the info....
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      12-11-2007, 03:43 PM   #17
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Quote:
Originally Posted by MBMWTECH View Post
YES - GO GET IT FIXED
Wow. I just got the car on 11/20. Shocking I would have this problem already. Does it affect anything else? It doesn't bother me much.
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      12-11-2007, 04:00 PM   #18
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Quote:
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Wow. I just got the car on 11/20. Shocking I would have this problem already. Does it affect anything else? It doesn't bother me much.
As long as your car is a 9-2007 production or earlier its affected. as the bulletin states all new 3 series cars up to 9-2007 can be affected.

You would be surprised how may people (usually women) have the car towed in due to this problem. It gets much worse in the cold weather. The pedal feels like stepping on a rock - not like it should.

This bulletin just came out in november 2007 - my e90 330 had this problem - i lived with it for 6 months till i got rid of the car because at the time there was no fix for it -- my 335 has yet to have this problem.
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      12-11-2007, 04:38 PM   #19
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i have this problem but i am afraid to bring it in and they tell me that i have to upgrade to the newest program like the 08s have
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      12-11-2007, 06:21 PM   #20
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Quote:
Originally Posted by theDude View Post
Oh, I have this problem too...I always thought I was just being too gentle on the pedal, but I could have sworn when I first got my car it didn't take much pedal pressure to get it to start. I've been using much more pedal recently to start the car, because I hate hitting the button and have nothing happen.

Thanks for the info
+1 Same thing. Going to call my dealer now since the car is there currently..
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      12-11-2007, 06:25 PM   #21
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Originally Posted by theDude View Post
Oh, I have this problem too...I always thought I was just being too gentle on the pedal, but I could have sworn when I first got my car it didn't take much pedal pressure to get it to start. I've been using much more pedal recently to start the car, because I hate hitting the button and have nothing happen.

Thanks for the info
I hear ya. Most cars have a couple good strokes left in them before the vacuum runs out.
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      12-11-2007, 06:31 PM   #22
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i have this problem but i am afraid to bring it in and they tell me that i have to upgrade to the newest program like the 08s have
What is the big deal with the 08' program. I just had my fuel pump replaced and they said my program required 3 upgrades. Talk to me man...what is the issue.

One thing I noticed is more turbo lag in standard drive. It's like the car really jerks if I hit the throttle too hard. I need to concentrate on rolling the throttle on slowly based on the speed or my family is pissed off because their heads jerk around in the car.

The new program in my car doesn't seem to be a smooth in throttle response "Bone Stock" or without the Procede. I'm not putting it in until I receive the V2 which will probably be the day I turn it in when my lease is up.
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