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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-18-2011, 08:48 PM   #41
ttrinh9
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So did this DIY help anyone else here?? I have this high pitched whistle when car is warmed up.. It goes away as soon as I step foot on the brakes.. And comes back when I release.. Just looking for some successful feedback from people.. Thanks !

Last edited by ttrinh9; 10-18-2011 at 08:50 PM.
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Old 11-11-2011, 07:53 AM   #42
9Benua
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I got the whistle noise. It's gone when I slightly step foot on the brakes. Does it mean an easy fix or replacing the brake booster? My brake is working fine for now. Beside the annoying noise, will it somehow affect my brake? Is there any danger ignoring it? Money is a bit tight and I probably will need to do this next year instead if it's indeed the brake booster which will need to be replaced.
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Old 11-15-2011, 12:23 PM   #43
Itzed
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Quote:
Originally Posted by 9Benua View Post
I got the whistle noise. It's gone when I slightly step foot on the brakes. Does it mean an easy fix or replacing the brake booster? My brake is working fine for now. Beside the annoying noise, will it somehow affect my brake? Is there any danger ignoring it? Money is a bit tight and I probably will need to do this next year instead if it's indeed the brake booster which will need to be replaced.
I have lived with this for about a year and a half now, with no change in the sound, and no perceived negative effect on braking. However, I must state that YMMV, and for safety sake, you take your own chances and make your own decisions. We only hear it in the warm weather, and I gave the car to my wife, who turns up the radio. I am sure that I'll replace the brake booster next spring.

Ed
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Old 11-20-2011, 09:49 PM   #44
king2218
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Is there a danger in ignoring this? I have had the noise for about a year now
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Old 11-29-2011, 09:51 AM   #45
crazydave
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I had the whistle sound and a crumple sound during the release of the brake pedal.

It had been 5 years since I had a brake bleed (way overdue) so I did one this past weekend.

So far the bleed solved the noises.

I pumped the pedal until the creaking noise stopped, while at the same time, using a pressure bleed tool from Bavauto.

Time will tell if the sounds stay at bay.
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Old 01-17-2012, 12:42 PM   #46
subliminalaudio
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Quote:
Originally Posted by Kris.R View Post
So I went through several of threads trying to find a cure for my issue. A brake pedal that would make a whistle type sound when the brake was applied and released. Everyone that had success with the noise being gone stated that the dealer changed the brake booster under the CPO and the sound went away. Since a brake booster is a pain in the ass to overhaul and wouldn't even seem that it would be the brake booster itself made me think that it was much more simple than that. Well, I certainly did find out that it was much more simple than that.


Parts to Purchase:
You will need part #4 and #5 from the diagram below.
The part number for #4 is 34336765316 (Gasket)
The part number for #5 is 34331160183 (Non-Return Valve)
Both parts cost around $20 from the dealership.


You will need to purchase a hose clamp like the one below.


Replacement Procedures:
- You will need a pair of plier cutters to cut the old clamp.
- After you have removed the old clamp, gently pull on the hose with the Non Return Valve connected to it and out of the brake booster.
- Now take a pair of adjustable pliers and clamp the old Non Return Valve and twist left to right while pulling it up and out of the hose.
- Once you have accomplished that, insert the new Non Return Valve by hand into the hose.
- Next, you will need to replace the Gasket on the brake booster from where you pulled the Non Return Valve.
- Once you've done that, go ahead and plug the Non Return Valve into the Gasket hole and clean up.

Now start your car and pump the brakes, guess what? No more whistling from the brake pedal!


*Everything provided in this DIY is at your own risk and I am not in any way responsible for your mistakes or broken parts resulting from non experienced persons.
=========================================================
sorry for reviving this old tread .

i will try this today . i went to the bmw and i spend 14 dlls for supplies and 1 dll for the clamp at napa.


lets see how it goes.

one question !! when i pull the hose will some liquid will be lost?

do i need to buy brake fluid ?


also i saw someone said to clean

is also necessary to clean the dc as someone else recommend here ?
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Old 02-28-2012, 11:14 PM   #47
androofoo
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^how did it go?

im getting a noise only when releasing the brake pedal. high pitch squeaking noise.
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Old 03-04-2012, 07:53 PM   #48
fire_andre
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my mechanic say that he maybe can solve the high pitch noise from brake booster when the brake not use and the noise gone when we step on the brake pedal without changing the brake booster.

he say that he will dismantle the booster and change the seals (/or parts?) in it. and it will cost me only USD$40-50 (cheap labor in Indonesia ). i will do the service about 2 or 3 weeks later because next weekend i have scheduled for vacation with my wife and friends .

so, next month i'll post the result after my mechanic fix it.
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Old 04-03-2012, 04:06 AM   #49
fire_andre
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Originally Posted by fire_andre View Post
my mechanic say that he maybe can solve the high pitch noise from brake booster when the brake not use and the noise gone when we step on the brake pedal without changing the brake booster.

he say that he will dismantle the booster and change the seals (/or parts?) in it. and it will cost me only USD$40-50 (cheap labor in Indonesia ). i will do the service about 2 or 3 weeks later because next weekend i have scheduled for vacation with my wife and friends .

so, next month i'll post the result after my mechanic fix it.
finally my brake booster is repaired, but unfortunately i can not post any picture because it was brought by my mechanic to a workshop that had a device that can pull out the seal and replaced with new seal with the device.

my mechanic alone with common tools can not remove or place the seal to the brake booster.

it cost me about us$33 (the workshop fee) and us$22 for my mechanic (his job is brake booster removal and replacing it back).

sorry that i can not give more info, but one thing for sure that the brake booster is repairable.

Last edited by fire_andre; 04-10-2012 at 01:27 AM.
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Old 05-04-2012, 09:50 AM   #50
ttrinh9
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Any more input on this issue guys?
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Old 05-04-2012, 10:02 AM   #51
molten330ci
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couldn't stand the squeaky! sold it.
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Old 05-05-2012, 10:56 AM   #52
NJfistpumpin
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This is bothering me big time... You say sell it, I'd rather light it on fire...
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Old 05-05-2012, 11:29 AM   #53
molten330ci
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Hah...I know how you feel, about a $600 repair done at dealershit.
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Old 06-01-2012, 10:55 AM   #54
NC BMW fan
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I'm a new member here and first let me say this site is fantastic! There is a lot of great info here that has helped me work on my car. I have this same whistle/hissing noise on my car. I just took it to my mechanic today. Several things he pointed out that were mentioned on here. 1) it's a small vacuum leak in the brake booster due to a torn/work gasket. 2) the typical (according to him) culprit is a rubber gasket on the INSIDE of the firewall where the arm goes into the booster body/neck. I don't know yet if that gasket can be replaced or if a new booster is the only option.

I watched him trying to diagnose the problem. Unscrew the oil fill cap, but leave it on the valve cover. Gently lift up on it and feel if there is any vacuum resistance. There should not be. If there is, you have a vacuum leak AND the brake booster vacuum line attaches on the valve cover side of the engine. Not the intake side as most others do. I hope he's correct on this. I appreciate the $183 Pelican Parts heads up. My guy quoted me $900 parts and labor.
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Old 06-02-2012, 11:30 PM   #55
mxsoto15
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I just had the same problem. Had the noise and when I would step on brake it would go away, also when I would open the oil cap it would go away. Saw this thread and bought the valve from my dealer for $11. Took me 5min. Fixed that annoying noise!!!! Thanks Kris.
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Old 06-03-2012, 10:27 AM   #56
NJfistpumpin
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Quote:
Originally Posted by mxsoto15 View Post
I just had the same problem. Had the noise and when I would step on brake it would go away, also when I would open the oil cap it would go away. Saw this thread and bought the valve from my dealer for $11. Took me 5min. Fixed that annoying noise!!!! Thanks Kris.
So I'm assuming the fix was easy? Any. Chance you have a couple pictures from the quick fix? I wanna do this next weekend and finally get rid of that absurdly Annoying noise
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Old 06-25-2012, 10:03 AM   #57
dozug
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has anyone resolve this? im the one who having the issue with the vaccum noise inside the car when i turn on the car and would go away if i apply brake or drive the car..

i have been having this nearly two years but yeah my brake works fine too.. I will try the replacing the parts above, but every mechanic i take it to say that I have to replace the booster, and quote me around $400~500.
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Old 06-25-2012, 11:25 AM   #58
NC BMW fan
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I have not bought the gasket yet to try it, but I have taken it out to inspect it. The gasket is intact so it looks like a new booster for me, but I'll spend the $10-$12 first to make sure. I'll let you know once I do it.
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Old 07-01-2012, 08:12 AM   #59
xxilikericexx
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Was anyone able to fix thier issue with a pedal that makes a crumpling/whistling sound only when depressed?
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Old 07-02-2012, 10:56 AM   #60
NJfistpumpin
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So I was at Motorcepts in queens last week and Leo listened to the noise and said it was the brake master cylinder. That it's slowly starting to go and the whistle that you hear is vacuum leaking out and that it isn't completely bad until you hear a much louder whooshing sound. He said you can last 10-15 k miles with that before it should go bad. Hope this helps you guys I'll be getting it fixed within the next month..
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