I thinking what is going on. During braking from 60 to 40 ( in higher speed it is much more less) I feel vibration on steering wheel and if my TT will be with steel rotors it is clear what it is but with PCCB? Any idea? maybe it is not rotors?
It is possible that PCCB could bend? (I don't thin so!)
Otherwise braking is perfect but this vibration is only one thing that I like to remove.

 

How rough is the vibrating? Are your pads OEM?

 

Pad deposits....

 

Pad deposits? How to remove? With normal steel rotors I could use hard racing pads to clean but with PCCB?
Pads are OEM. And vibration coming to be highest at 70 to 40 and too rough me....

I have PSS09 by FVD and set up as GT2 with a bit more negative aligments than stock

 

I use this to remove pad deposits on my motorcycle rotors everytime I change out the pads.


Rotor Hone Tool

I've never tried it on carbon rotors though.

-M

 

So after all I still have some vibration new rims,new tires, PSS9 and PCCB.

I have 996 GT3 too and it has now vibration at all ! I even find that I Ihave vibration (very small but I find it after gt3 drive) when I drive straight with any speed . Maybe I am crazy but I am going to be angry why my GT3 is vibration free against my 996 TT.
Any ideas? PLS

 

Vibration? Or pulsing?

When did the vibration appear? Out of the blue? Or after some work on the car? Or perhaps at some other time or event?

Could be as Pwdrhound offered pad deposits. I know this can happen with iron brakes and cause them to vibrate -- well, pulse -- under braking.

However, I am not aware of what kind of situation would arise with PCCB's that could cause this. A WAG would be perhaps leaving the brakes applied with the brake hardware exceptionally hot.

Are you sure tire pressure is ok?

What about wheel/tire balance? These Porsche tires as they wear can go out of balance and it is no unknown to have to have them rebalanced at some point again the initial balance when new.

What does the brake hardware look like? Any signs of chips or other damage?

A bit more involved but you might want to check wheel/tire and even brake rotor runout just on the outside chance one of these is out of spec.

Also involved but if you get to this point without a solution/answer checking the rotors for in spec parallelism might be called for.