You can't check for warped brake rotors by looking at them. There can be thickness variation of just a few thousandths of an inch that will cause a pulsation. That's the thickness of a sheet of paper. Even if the thickness is perfectly equal all the way around, the disc can be cocked on the hub causing "lateral runout". That will cause it to move the brake caliper left and right which can tug on the steering linkage and steering wheel when braking. Worn or loose steering and suspension parts can aggravate the vibration.
April, 5, 2013 AT 3:44 PM
Thanks caradiodoc. So which parts should I start to look at, suspension mounts?
April, 6, 2013 AT 12:19 AM
The rotors have to be measured with a micrometer for thickness variation and a dial indicator for lateral runout. It is easier and faster to just remove them and have them machined. You'll instantly see any slight warpage when the cutting bits skip over a part of the surface during the first cut.