Hello everyone,

I have a 2005 350z (track edition) with around 25000km. The car is used exclusively for track.

The problem that i am facing is a vibration in the steering wheel under medium braking. It goes away under hard braking.

Current state:
kw v2 suspension
ebc rpx pads and ebc race discs with stock brembo calipers
stock wheels with new semislick tyres
whiteline bushings + uniballs


I can’t figure out what’s causing the vibration. I know the discs and pads are ok (i regulary change the pads due to wear ), the tyres are also well balanced. I thought it’s bushings, but changed them and i see no improvement in the vibration.

Has anyone else faced this? Any ideas what could be wrong?

Thanks!

 

How do you know rotors are okay?

 

This ^^ (have you mic'd them to measure runout and checked for warpage?) And, have you checked play in wheel bearings?

 

Bearings would be second place to look

 

Make sure you aren't getting metal transfer build-up. One needs to clean the rotors with a number of very hard stops to resolve this problem.