Did you torque the wheel bolts properly? Over-torquing will cause the discs to warp.

Did you drive into a puddle with hot-hot brakes? I've seen folks warp discs that way. Maybe hit a car wash with hot brakes?

Just throwing out ideas...

__________________
John Shellenberg
1998 C230 "Black Betty" 240K

http://img31.exs.cx/img31/4050/tophat6.gif