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Old 07-24-2010, 03:53 PM   #1
drivetolive
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Squealing Sound

Sometimes (like last night) I was getting a squealing sound from my back passenger side tire. It can only be heard when the windows are open, usually when I'm driving straight and accelerating from a stop.

It would come and go. But I had been driving around for about an hour and began noticing it when pulling into a residental area and accelerating from stop signs. Kind of sounded like a bird tweeting lol. Sometimes it would be very slow and other times it would speed up (the noise).

The car was sitting for about a week. Drove it again today and couldn't hear anything. Can't even take it to a Rocco b/c I won't be able to reproduce the problem (only happens sometimes).

Anyone know what it might be? Or what I should check for if I jack the car up?
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Old 07-26-2010, 12:08 PM   #2
uzi577
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Is the noise comes up only when rotors are cold?
does the noise happends only when accelariting and/or braking ?
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Old 07-26-2010, 12:26 PM   #3
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The noise only appears when accelerating. I would say the rotors are far from cold because it usually happens after I've been driving around for a bit.

But even after the long trip to Eurofest yesterday I didn't hear anything. Like I said, it comes and goes when it feels like it lol. Maybe it was just a fluke/glitch .
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Old 07-28-2010, 07:16 PM   #4
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could be your shock mount or your rear shock... my does the same

I have yet to address it, but I will shortly as its getting annoying
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Old 07-28-2010, 09:56 PM   #5
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you check your ebrake? Could be the first signs of a binding brake... How about rotors or the caliper pins... If the caliper pins were beginning to seize, then you'd get the squeeking (more when they're hot after braking)... Under load (acceleration) there are more torsional forces in the rear that if they were beginning to bind would cause the squeeking you're experiencing.... Rotors could be warpage, but that wouldn't come and go typically.....
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Old 07-30-2010, 09:25 PM   #6
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Doubt it's the brakes b/c they were replaced about ~3000k ago. The noise doesn't seem to depend on whether or not the brakes are hot or not. But will check it just incase.

The noise just came back today. Seems to come when the car sits for a couple of days.

Will check the shocks/shock mounts. I think the noise might be coming from the front now. Lol might just give up and take it to Rocco soon.
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Old 08-02-2010, 03:00 PM   #7
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keep us posted.... i still feel like its going to be shock/ shock mount related
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Old 08-02-2010, 06:35 PM   #8
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^^^Think you may be right dude. I also hear a kind of a metal-on-metal clunk noise sometimes when going over small bumps. Can't be my fcab's because I just had those replaced. Might be my endlinks but last time I checked they were fine. What should I look for specifically in terms of the shocks/shock mounts?
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Old 08-09-2010, 12:48 PM   #9
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I was getting a metal scrape from my left rear brake that came and went. I thought it might be the backing shield that got bent. Found the problem! Large piece of gravel wedged between the rotor and backing shield. Pried it out with a screwdriver. This was a very cool and easy repair.
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Old 08-11-2010, 06:42 PM   #10
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Quote:
Originally Posted by drivetolive View Post
^^^Think you may be right dude. I also hear a kind of a metal-on-metal clunk noise sometimes when going over small bumps. Can't be my fcab's because I just had those replaced. Might be my endlinks but last time I checked they were fine. What should I look for specifically in terms of the shocks/shock mounts?
you're gonna have to take the wheel off and play around with it (on a hoist)

im actually gonna go check mine out this weekend, ill let you know what I find
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Old 08-18-2010, 11:10 PM   #11
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^^^Let me know what you find.

Some update on my problem, it seems like the noise is more so apparent on a hot day. ALSO**** it goes away after I brake. Even a small touch to the brake pedal will cause the squeal to go away.

Like I said, it doesn't happen all the time but it's driving me nuts .
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Old 08-21-2010, 04:12 PM   #12
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sorry haven't been in the country so my car has been sitting, haven't really had a chance to look at it

(been taking the motorcycle to work)


if it goes away when braking it sounds like a warped rotor, or at the very least something to do with your brakes no?
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Old 08-28-2010, 04:21 AM   #13
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I have the EXACT same problem on my 2001 325i. We have fiddled with the shock mount, the rotors, even had the brakes checked... still can't figure it out. And the shop says we can't diagnose based solely on sound!?

Same thing..when I tap brakes while in motion, the sound disappears..
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Old 08-29-2010, 08:34 PM   #14
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Had it checked out by RMP, ended up being the brakes. They just needed a brake service. Not only is the sound gone, but they feel better too.
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