Tin Can / Bottom Scraping Noise

[evanescent03]

subscribed. noticed it after pulling out of the dealership for the first time. I was glad I'd read it was a common finding beforehand so it didn't ruin my first miles. heard it again last week (~1800miles now). strange noise, indeed. sounds like something rubbing along the edge of a metal hear shield which would cause a high frequency vibration of the metal. nails on a chalkboard for sure. nothing else to add but will be nice to confirm it's NBD.

[bgreen4544]

Heard it as well on m4 for first time today, can noise.
I always hear the pebbles at low speeds but the tin can dragging is concerning.

[stressdoc]

Question: What do we know about the noise on cars equipped with (a) 18' wheels, and (b) CC brakes?

It occurs regardless of tranny, both manual and DCT cars have reported it.

[Needsdecaf]

Originally Posted by solstice

Yes, it's rather high pitched, very different from normal ABS sounds. I first thought it was DSC since the first time it was during hard acceleration on a bumpy road but now I heard it during slow down and very mild acceleration. It's more like a fast spinning cog grind or a shield touching something relatively fast spinning. I can't place it with common sounds. At the very first I thought it was tire rub with the fender but no sign of that.

That is exactly what I heard on Monday. All 6 cars had it as they went around a hard 90 degree left.

They all had 19's and CCB's.

[Wah]

I can't imagine BMW would ignore this... there has to be a fix coming for this.

[Homsyboy]

So today while leaving my garage there was a scraping noise coming from my car. It sounded like a tin can being scraped across a metal bar. As soon as I heard it I stopped and then when I tried going it went away and I wasn't able to get a video of it.

Later that day getting off the highway I heard it again. This time it didn't stop and so I had to get it flatbedded to bmw at 1 am and now I'm waiting on them. Unfortunately I don't know how to post a video but it was horrible. Just thought I'd let you guys know

[KHATTI]

This could be the issue others have reported around objects getting stuck in the shield that protects the rotors. There's a few threads on this. Hope that's the case.

[jbtco]

There are a number of suggestions on here but doesn't seem to be any definitive answer. I have had it in early days but not recently. One suggestion is that it is to do with the handbrake and it helps to periodically apply the handbrake briefly when moving off slowly especially after driving on wet roads or the car having been washed or left in the rain.

[minisbmw]

Yes I have had the same noise a couple of times and it has gone a way. Interesting about the rain or washing the car as that noise occured after washing it and leaving it overnight. Also is there an issue with the hand brake ? Please post what they discover.

[Vigilant]

Originally Posted by Homsyboy

So today while leaving my garage there was a scraping noise coming from my car. It sounded like a tin can being scraped across a metal bar. As soon as I heard it I stopped and then when I tried going it went away and I wasn't able to get a video of it.

Later that day getting off the highway I heard it again. This time it didn't stop and so I had to get it flatbedded to bmw at 1 am and now I'm waiting on them. Unfortunately I don't know how to post a video but it was horrible. Just thought I'd let you guys know

Tin can noise...supposedly related to heat shield and e-brake cable. My concern with your car is that the noise did not stop...let us know the diagnosis when you can. Thanks.

[Homsyboy]

Wow. Turned out it was a big rock in the break shield which is why it didn't fly out. Stupid construction tore up the roads around my place so there's rocks everywhere.

Turns out I had a nail in my other tire though. $390 a tire $430 out the door :

[AllenF82]

I had the exact same issue last night, drove the car this morning and didn't have any issue.

[Vigilant]

Originally Posted by Homsyboy

Wow. Turned out it was a big rock in the break shield which is why it didn't fly out. Stupid construction tore up the roads around my place so there's rocks everywhere.

Turns out I had a nail in my other tire though. $390 a tire $430 out the door :

I am glad that it was just a rock...sorry about the tire...holy cow, 430 for the PSS!

[Bubbles]

Originally Posted by Vigilant

I am glad that it was just a rock...sorry about the tire...holy cow, 430 for the PSS!

Viligant, less posting more driving. Otherwise throw me the keys.

[Vigilant]

Originally Posted by Bubbles

Viligant, less posting more driving. Otherwise throw me the keys.

Your avatar lacks resolution. You look like a hot tamale!

[minisbmw]

i guess the rocks are the issue here i wonder if it is due to the drilled rotors. Is there a different type of brke shield that could be put on to remedy the problem ?

[Wah]

BMW are you listening??? This is ridiculous.

[Congen]

Happened twice so far to me

[bcl0328]

Originally Posted by Homsyboy

Wow. Turned out it was a big rock in the break shield which is why it didn't fly out. Stupid construction tore up the roads around my place so there's rocks everywhere.

Turns out I had a nail in my other tire though. $390 a tire $430 out the door :

why not just have a shop patch the tire? i had a nail in mine 2 years ago and it's been fine ever since. only $30.

[Homsyboy]

Originally Posted by bcl0328

why not just have a shop patch the tire? i had a nail in mine 2 years ago and it's been fine ever since. only $30.

They said that its to far towards the outside to patch

[MFNATIK]

Originally Posted by bcl0328

why not just have a shop patch the tire? i had a nail in mine 2 years ago and it's been fine ever since. only $30.

Some places like America's Tire Co. do it for free.

[smedin]

Heard the noise as well, on and off. Noise will stop on command when I lift the e-brake 2 notches. I guessed it was a stuck rock, but it's happened 3-4 times now, always resolving itself after short stints. Sounds like it may be a design flaw if it's frequently trapping flying rocks...