Wheel shudder during high speed braking (120km/hr - 200km/hr). Would this be caused by wheels out of alignment/balance? The steering wheel vibrates badly when braking from high speed, with the vibration lessening as the speed decreases. It does not happen at all under 110km/hr. This is a recent development and did not occur a few months ago. The Z has not been in any prangs or incidents in that time. Any ideas? Thanks.
Check multiple posts/threads on this issue during the past year. L&P, Myself(and numerous others) reported similar problems. One common problem was the Lower Radiator Support Panel being ripped/cracked apart, which in L&P's case resulted in tearing the Lower Tension Rod brackets off the car. My car required the whole front end of the chassis rails to be welded and repaired.:zlove:
Rotors need machining and new pads as the others have said, I currently have the same problem for the second time in 10,000k's on new rotors.
Not ignoring Chili's post re cracked lower rad support panel, when I had new rotors (DBA slotted) fitted to the front, the mechanic recommended stopping further behind the car in front than I normally would have, then creeping forward very slowly to prevent a hot spot building up on the rotors, which may warp them. It's worked so far (20,000km). With the previous rotors (original OEM (very thin), reaching the end of their life) I needed to get them machined almost every 5,000km, until I was told they were no longer serviceable. Of course, if you are braking very hard from speed, the other possible cause of vibration is your ABS kicking in.
