Quote:
Originally Posted by BimmerRob08
Good technique, but I already measured run out on the orginal disc's from AP. They were about 007" which was too much. Stilen has been working hard with me to figure this problem out. They rebuilt the strap drive on those discs and still no difference. O actually ended up getting new discs a year ago for this problem from AP and the problem is the same but the vibration is a little better on the second set. We'be even tried a different set of AP calipers with street seals and removed the piston springs to allow less pressue on the disc while at cruise.
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Great to know that Stillen is helping out, always good to have reputable service.
Is it possible to get some non-strap drive discs that can safely fit under the front calipers and then go for a test drive to truly rule out the AP strap drive discs as being the culprit?
Also, you could use other good quality fixed-floating brake disc (oem for example, you only need one disc) and then remeasure runout to make sure that the wheel bearing is not the one causing the problem.
Unless, you have tried the above already, and we can move on.
Another thing to do is to rule out rear chassis and propshaft vibration, which is done by raising the car securely (wheels completely off the ground) and running the car up to the speed that you get vibration. If you get vibration, then it isn't from the front chassis, or it could also mean that the front chassis isn't the only source of vibration.