Originally posted by Big Jim:
Although it is not all that common on Contiques, drums actually can warp, or more correctly become out of round. When they do, they can also cause brake shudder. This was real common in days of old when drums were still common on front brakes. Don't ignore it as a possible cause.
Mine were out of round on my `tour. It drove me nuts trying to find it too. One night, just out of curiousity I lightly applied the e-brake just enough to make the car start to decelerate. There was my vibration. A new set of drums and the problem was gone. It also got rid of the unsightly rust problem the originals had.
