Scratching my head on this one!!

I recently installed a front 355mm/ST60 Stoptech kit.

Is it common to get creaking noises from the hats under heavy cornering loads?

I only get this with my 9.5 track rims and R-comps, not with the stock rims and tires. Sounds like a mettalic clack, clack under heavy cornering load. At first I thought it was some type of tire or rim rub, but after lots of investigation,taping and marking I can find no evidence of any rotational contact anywhere on the bodywork, suspension, rotors, calipers, rims or tires.

I am suspecting it has something to do with the torque load on the rotor hats only because during the course of investigation I have found that removing and refitting the wheel sometimes causes the noise to dissapear or reappear unexplainable. I am torquing the rims very evenly with a torque wrench but I notice they do creak sometimes when the nuts are being tightened.

 

When the rotors are new, the sping washers on the mounting hardware will make a little bit of noise under load as the nubs flex. As you drive, the spring washers will loosen up a little bit and the noise will tend to go away. This is more to do with hub flex than anything else, so if youve done a lot of track or your car is a few years old, you may need to look at getting them serviced.

 

I never had problems with mine. Same set-up too....

 

Yup, the spring washers on the Aerorotors will loosen up when the brakes are used aggressively like after a track session. Happened to me all the time. Its an easy fix, you just need to replace the spring washers on the rotors.

 

OK, Thanks for the replies. The information about spring washers and hub flex being involved makes sense.

Are the spring washers a particular spec? I only have access to limited hardware here. Also what is the correct torque for the hat bolts?