Quote:
Originally Posted by JH1
It is possible for small stones to get stuck within the calliper, quite often they will eventually come out of their own accord but they can cause damage in the process. If the stone is out and nothing has cracked you should be fine despite the ring marks you see on the disc, they will eventually wear even again over time and shouldn't really affect your braking efficiency to any great extent.
On a similar note, I have just had to have my rear discs and pads replaced under warranty after only 20,000 miles. They are barely worn but have warped for no apparent reason other than the quality not being what they used to be. Again, my car is driven very respectfully so it doesn't get a hard life, so I was somewhat surprised this should happen.
On the positive side, my BMW dealer has been very efficient and made the process as painless as possible, so I'm thankful for that.
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I had my rotors warp once on my Volvo. I was told it can be caused by lug nuts torqued incorrectly and hot brakes going through a puddle of water. Not sure if it was the same in your case or it was even correct info that I was given. The more performance brakes are softer. Wish I could put on slotted disc when it's time to change mine. But for now I'm ok with only 1,200 miles on car.