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-   -   Infamous 335i Brake Squeak/Squeal (http://www.bimmerfest.com/forums/showthread.php?t=549128)

Gimlet40 06-17-2011 11:29 AM

Infamous 335i Brake Squeak/Squeal
 
Hey everyone, I am new to this forum. I drive a 2008 335i sedan, and love everything about it. Except one thing: the brake squeaking. I am sure many of you are familiar with this problem that plagues most of 335s on the road (well at least 2007-2008 for what I know). If you don't...well when I accelerate from 0-20mph the brakes squeal. When I pull into parking lots, the car squeaks the whole time, which causes people to turn heads, but not the way I want.

From what I understand, the design of the wheels causes the sensor to somehow scrape along something and create the noise (correct me if I am wrong). I am starting college this fall, and would like the noise to be eliminated, if not reduced by then. I'm sure the ladies won't enjoy the ear piercing squeal when I pull into the parking garage. ;)

So onto my question...have any of you been able to stop this problem? I am aware that squeaking happens in almost every braking system, but I know its not as often or bad as the 335i brake squeal. If so, what do I need to do to eliminate the problem. BMW has replaced the brake pads twice, which only stop the noise for about 6 months. Otherwise they tell me to slam on the brakes to clear the break dust, which only temporarily fixes it. Any help is appreciated. Sorry for the long post!

Gimlet

markl53 06-17-2011 12:05 PM

I've owned 3 BMW's, including an '08 335i, and never had a brake noise issue. So I'm not sure the characterization that most E90's are plagued with this is accurate. Is it a regular squeak or the wear indicator scraping along the rotor as you seem to indicate? I wonder if the pads are OEM or if there's some mis-alignment of the wear sensor if that is the problem. Wear indicators make a very loud screeching sound when you are NOT applying the brakes. Something out of the ordinary is wrong with that car, IMO.

johnc_22 06-17-2011 12:17 PM

My 2007 has done this for the past 25K miles. The dealer's response: "they all do that". It's definitely not the wear indicators as I've still got the same rear brakes that I had 25K miles ago. It's annoying and horrible sounding, and worse in warmer months (well, it doesn't occur unless the car is very warm).

It's inexcusable but good luck getting it fixed. I'm now OOW so once my rear brakes are toast I'll get an indy to fix it once and for all. I've heard that people have the sensor zip tied out of the way so it can't rub on anything but that doesn't sound like a real solution.

hmr 06-17-2011 12:46 PM

I strongly believe the brake sensors are not the culprits. Prodigious amounts of anti-squeal compound are required at the brake pad/caliper contact points to deal with the issue.

Gimlet40 06-17-2011 01:20 PM

You are lucky you did not have to deal with it. I know 2 other people with 335s and they both have the same problem. BMW also told me that its just the design and there really isn't anything to do except slam on the breaks once in while to clear the brake dust.

I did get some suggestions to take my car to a non-dealer mechanic and have them look at the brakes and try some various stuff that will help the sensor from not contacting with the rotor. Thanks for the replies though. If you find a way to fix the problem please let me know!

Bcube 06-17-2011 01:22 PM

At 110K miles, I changed out the pads and rotor to aftermarket, and replaced the sensor to the latest number: 34356792564 (from 3/10). Nary a peep from the right rear side. It was the first time it has (permanently) gone away.

Since I did three things at once, I couldn't tell which item fixed it, but since the brake sensor is on its third part number I would go with that step first. If that doesn't fix it, then go with the latest brake pads - one does not hear about the low speed brake squeal from the 2010+ models.

(Rotors and calipers remain the same part number for all years of E9X 335i. So it is a process of elimination. Sensor first, then pads)

CT 06-17-2011 01:52 PM

I had 68k on the original brakes and never had a single peep out of 'em.

Sky Keeper 06-17-2011 02:57 PM

I heard it just a few times over 52k on stock pads - was not able to reliably repro.
I have it on track pads, but this is expected, and is not too bad - just a sqeak from one or the other wheel when lightly braking to complete stop.
Does it squeal on all wheels?

I'd recommend getting anti-squeal paste, then taking caliper apart, inspecting guiding bolts, applying paste between caliper and pads, putting everything back together, and tighting up to specs. Then do a pad break-in procedure.

Bcube 06-17-2011 04:14 PM

^^^This squeaking is not caused by applying brakes. It is specifically the right rear brake area (the one with the sensor). It squeaks at low speed. BMW has a SIB against it.

Sky Keeper 06-17-2011 06:41 PM

is it a sensor vibrating inside pad?

SteveGiant 06-17-2011 09:50 PM

I drive a 2008 335i with manual trans and I have the same issue. Computer says 3400 miles until rear brakes need to be serviced. I notice the squeak at low speed and also when I set the parking brake and get out of the car. The weight shifting when I step out also causes it. I hear it on the driver's side but that may be because that's the side I'm on... Debating whether to blow it off until recommended service interval or sooner.

Gimlet40 06-18-2011 06:02 PM

So if I have BMW look at it and specifically tell them to replace the sensor, rotor, and brake pads they will? I do not have the knowledge and skill to take my car apart, and my BMW dealership has brushed it off the past three times. I am willing to try to get the sensor replaced before I go aftermarket. So my next question is do I take my car back to BMW or do I look elsewhere?

Sky Keeper 06-18-2011 07:07 PM

problems like this are hard to fix, so I'm not surprised dealership did not bother.

Gimlet, where exactly the squeal is located? If it's rear sensor(rear right wheel only), and don't mind getting dirty, you can try removing it from the pad and ducttaping to a brake line.
But if other wheels squeal, then it's definetly pads/rotors/calipers.

How many miles left till you need to change pads?

Bill-SD 06-19-2011 07:08 AM

There is a huge thread on this. I'm also of the camp that most E9x's go through this. Take a look for the tread I'm referring to (can't mistake it, it's really long) and you'll see what others have done. Personally, I took mine the the dealer and they fixed it. That was probably a few years ago now and the squeal has not returned.

CALWATERBOY 06-19-2011 09:48 AM

Quote:

Originally Posted by Gimlet40 (Post 6137673)

From what I understand, the design of the wheels causes the sensor to somehow scrape along something and create the noise

So onto my question...have any of you been able to stop this problem?

No squeak here.

Isn't BMW's sensor designed to complete a circuit (to the rotor) when the pads are nearly gone? Some pads have a tab that, when pads are nearly worn out, contact the rotor to create a warning squeal.

Here's something.

Does it sound like this?
http://www.youtube.com/watch?v=kxdE12B8QXM

Could try this!

.

Gimlet40 06-19-2011 11:09 AM

Sky Keeper, I believe the sound comes from the rear wheels, especially the rear passenger. I am so fed up with the noise that I probably would try to duct tape it (although I dont think that is a permanent solution) but I honestly have no idea how to do that. And I will look later today at how many miles I have left.

Calwaterboy, that video is the main reason that I realized I wasnt the only one with the problem. That noise is pretty much the same as what I experience. But I do not think that my pads are almost gone, because when I take my car in they say my pads are still fine. And sorry I was not aware of the other thread, I will definitely check it out.

Gimlet40 06-19-2011 11:46 AM

So I read over some of the other threads and it seems as though most (I understand some people were lucky) were not able to fix the problem. I find this very frustrating. Even though I did not pay for my car, my dad is very upset because he paid for a BMW yet our car sounds like an old beater when we enter parking lots. We may go to our BMW dealership and talk about all the solutions you all have described and after some "strong convincing" maybe they will have a longer look at it. I love my car to death and want to start modifying it, but this squeaking is getting ridiculous. My parents want to trade it in and get a new Audi A4 because our local Audi dealership (which is just next door) has treated us much better than BMW. Before fall I will take my car to some other service shops that specialize in BMWs and see if they can fix it. If not, I guess I'll just have to live with it.

MB330 06-19-2011 12:48 PM

O Boy! You, guys, started.
Every time I pool at my work garage and everyone look at my car - I feel terrible.
When car was under warranty and make more then 4 attempts to bring my car and ask them to fixed. "they all do that" - amazing phrase that go from SA to SA , doesn't matter where you service your car. :thumbdwn:
Will see my mechanic soon with oil change and rear break service. Will see what happen. Thanks for sensor PN#. Hope this will fixed issue.

Bill-SD 06-19-2011 02:32 PM

This is the big thread I was referring to. For those who have not experienced this, it's not "normal" brake noise and do not happen when braking. And it very annoying and embarassing. For those who have experienced this...you already know these things :) Anyway, when mine did this the dealer ended up replacing the pads/rotors/sensors and the problem never came back. Maybe that was overkill, but it worked.

Sky Keeper 06-19-2011 05:32 PM

looking at the rear right wheel, the one with sensor, i don't see how it or a wire car rub anything there. I've tried unplugging and duct taping it - it did not eliminate the noise, but changed frequency and now it starts when I apply more pressure. I have track pads, so all 4 wheels squeal at some point, but that's expected.

So, good thing: there was a change.
Bad thing: I have no idea if I had the problem others talk about, since in my case it squeals only under light braking at low speeds.

kenomail 06-19-2011 07:22 PM

My 08 335xi Coupe did and dealer didn't hear it :)

Mace14 06-19-2011 08:06 PM

I don't get it and I think I'm gettng screwed. I've got 36,000 miles on my 335i Coupe and have yet to have my brakes squeal and have had no mis-aligned body panels, or broken seatbelt servers, or bad HPFP, or excessive tire noise, or exploding sunroof. I just get this feeling that I'm missing out on the whole BMW experience....do I have a lemon??? :mad:

Adamalb 06-20-2011 05:25 PM

yeah ive had this problem too on my 08 335i it used to piss me off!! i would drive infront of peopleand that ear splitting noise would humiliate me!! i went to the dealer and all they did was replace the rear brake pads and i never heard the noise again- hope this helps

kmorgan_260 06-21-2011 03:07 AM

I have owned a 2007 335i for a year and put >20K on it without ever hearing a peep from the brakes. I changed the rear pads about 5 months ago and the front pads and rotors about a month back and the aftermarket parts are quiet as a mouse also. I used ceramic pads on front but the cheap ones on back. The sensor should not drag if properly installed. It should travel with the pad so maybe something is amis there.

Anyway, you can tell your dealer that they don't all make noise. I feel your pain however since any little noise drives me crazy. Good luck.

luchini 06-21-2011 11:13 AM

Just keep taking it in to the dealership... i had the SAME exact frustrating problem. I had an 08 335i and from 0-20 it start going squeak squeak squeak and then disappear as if nothing happened. But I was relentless and took it in about 5 times before it stopped happening. Funny thing is, is that when I took it in to the dealership I could never replicate sound. Anyways, I forgot what they did to stop it but if you take the car in to the same dealership over and over again they will find out the problem and fix it with no money out of your pocket.


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