Brakes shutter on the highway
 

So I took the 400E out on the highway for a run after the new wire harness. Then I hit the brakes at like 65-70mph and I got a shutter throught the brake pedal, I'm guessing rotors need cutting or replacing? Off the highway I never felt that problem??

Warped rotors could cause the car to shudder when the brake is applied. A runout check with a dial indicator will confirm if the rotors are warped. Replace warped rotors. Turning MB rotors is not recommended.

Did the car see any significant storage? It could be corrosion on the rotors.

It sat for awile before I bought it couple months I think!

let me clarify, warped rotors cause the brake pedal to vibrate when applied, not shutter

Shopping for brakes I noticed that there were to different part number for rotors for my car??? Was there a mid year change in 92??? Also anyone ever use centric rotors not to familar with them?