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      01-30-2014, 07:36 PM   #1
gomichaelkgo
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Another Rock in the Brakes

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I got a rock stuck in my rear caliper yesterday. It sounded like the car was going to grind itself apart, but only for a block. This is the second time it's happened to me in a BMW, and never happened in any other car.

Are BMWs prone to getting rocks in the brakes?
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      01-30-2014, 07:38 PM   #2
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What are you driving on?
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      01-30-2014, 07:41 PM   #3
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Quote:
Originally Posted by snowghost View Post
What are you driving on?
A patch of marginal pavement -- no potholes, but the asphalt was crumbly. 20 miles per hour.
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      01-30-2014, 08:42 PM   #4
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I have never heard of this.

I think you have bad rock karama.
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      01-30-2014, 10:02 PM   #5
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Same thing happened to me last month. It was a crazy sound.
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      01-30-2014, 10:37 PM   #6
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I've never had this happen to me.
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      01-30-2014, 10:45 PM   #7
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I've had it happen numerous times in different cars. I think it's a function of how much loose gravel there is and how sticky your tires are (or the gravel for that matter). It IS a horrible sound.
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      01-31-2014, 09:22 AM   #8
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Not something that only BMWs are prone to. Has more to do with the roads one drives on than anything mechanical.
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      01-31-2014, 09:59 AM   #9
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I ruined a rotor on my Mazda CX-9 with a stuck rock and I once ruined 2 or more rotors on my E46 M3 following too close to a snow plow/sanding truck on the thruway during a snowstorm. (Not sure how many because BMW simply replaced all 4 rotors without question)
Make sure you get those rocks out ASAP!
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      01-31-2014, 11:06 AM   #10
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Quote:
Originally Posted by gomichaelkgo View Post
I got a rock stuck in my rear caliper yesterday. It sounded like the car was going to grind itself apart, but only for a block. This is the second time it's happened to me in a BMW, and never happened in any other car.

Are BMWs prone to getting rocks in the brakes?
How do you know a rock/pebble was physically embedded in the rear calipers?

Sometimes when I drive over loosely compacted asphalt, I get some "clinking" noise for a bit emanating from the wheel well. It kind of sounds like a slow-spinning food processor with small pebbles in it.

Is it the same noise found in the video below?

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      01-31-2014, 11:09 AM   #11
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no that is a metallic sound. Rocks make girding noises, and they immediately gouge up your rotor so if its on the visible side you should see a groove forming.
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      01-31-2014, 11:52 AM   #12
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Quote:
Originally Posted by Dr. Skillz View Post
How do you know a rock/pebble was physically embedded in the rear calipers?

Sometimes when I drive over loosely compacted asphalt, I get some "clinking" noise for a bit emanating from the wheel well. It kind of sounds like a slow-spinning food processor with small pebbles in it.

Is it the same noise found in the video below?
It was similar. I know it was a rock by circumstance. I drove over some crumbly pavement, heard rocks hitting the wheel well walls, and then the screeching/grinding. Just as suddenly as it started, it went away completely with a popping sound. I hope the rotors weren't damaged, as it had a rock in it for only one block.
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      01-31-2014, 01:04 PM   #13
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Most rocks/pebbles WON'T damage your rotors. At least not significantly enough to worry about it. They just make a hell of a racket.
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      01-31-2014, 01:07 PM   #14
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I guess I just had bad luck. The only times I've had them they ruined my rotors. Obviously the factor must be how hard the rock is compared to cast iron.
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      02-09-2014, 06:40 AM   #15
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I've had the same problem on my E39. Every time I drive on gravel with the car, a rock gets stuck between the brake shield and the discs. But that is a stupid design on the brake shields. I was hoping they had this fixed by now?
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