[AU335]

My car sat for about 2 weeks in the cold without being driven. Did not notice the problem before then. Now however, when I apply the brakes at any speed (especially 20mph+), I get a slight vibration and feel an almost balance issue with front wheel (feels like passenger side). Kinda feels like "apply braking...da(Feeling/noise)...da....da....da....da....come to stop.

I just installed brand new StopTech Drilled & Slotted Sport brakes 14k miles ago. The shop I dropped it off at said they couldn't fix them and the rotor was probably wrapped :/

Is that normal after 15k? Not a heavy driver or braking at all. No track days, just normal driving. Could it be something else that comes to your mind?

[BashShah]

Your shaking is most like your new rotor(s) that is wrapped.
contact seller ASAP for exchange.

DN

[AU335]

Originally Posted by DarkNemesis

Your shaking is most like your new rotor(s) that is wrapped.
contact seller ASAP for exchange.

DN

They would exchange after 15k miles on them? If it is wrapped, any tips/ways to avoid this in future? I really dont brake heavy at all. Normal commute driving mostly.

[batman_e92]

You have to break in the new rotors when you install them


http://mbworld.org/forums/c32-amg-c5...correctly.html

[AU335]

Originally Posted by batman_e92

You have to break in the new rotors when you install them


http://mbworld.org/forums/c32-amg-c5...correctly.html

yes of course. I properly broke in the new rotors when they were put on though.

[bloppitybloop]

Why did they wrap your rotors?

[critical05]

Since it wasn't doing it before it sat for some time, could it be that there is just some corrosion (rust) on the rotor on a certain spot? The surface would be rougher so the pads would grab more in this certain spot and cause symptoms similar to a warped rotor.

Jack the front of the car up, spin the tire. See if you get spot where the tire is harder to rotate, mark the spot and see if it happens in the same spot every time. At least you can see which side has the problem. To check if the rotor is warped, you would need a dial indicator to measure the runout of the rotor.

[asus389]

Probably rust or deposits on the spot where the pad was sitting. Will likely get better with driving. The e90 CPO I picked up did this, it had been sitting on the lot for a month. After driving it for a few weeks and its almost gone.

But yeah, the only way to know for sure it to put a dial indicator on it (and also the hub.. really). Our cars can tolerate some small amount of runout without being able to feel it, but it really varies depending on the pads/rotors.

[bender rodriguez]

This is why slotted rotors suck and are not worth it. They add zero performance and warp or crack more easy.

[Rick F.]

AU335,

Rotors wouldn't normally warp from just sitting around. I concur with the earlier poster(s) who said it's probably either modest corrosion on the rotors or pad transfer onto the rotors at the spot where the pads were. If the rotors got wet while the car was sitting, it's common for light surface rust to form on the bare steel rotors.

A fairly simple way to determine whether it's temporary corrosion / pad transfer or warping is to speed up to 60 mph or so and brake really hard. Then do it again 4 or 5 more times in a row. If the problem goes away, it was corrosion or pad transfer from sitting. If it's still there, you probably have warping. Make sure, obviously, to pick a safe place for this exercise, with no other traffic anywhere near!

Minor warping can be cured by having the rotors turned. General rotor corrosion can be prevented by occasionally using your brakes really hard.

Good luck, and let us know how things turn out.

Rick F.