Hi all.

I just had stillen cross drilled rotors and their metal matrix brake pads installed on the front of my 2K (tired of warping originals). Two things....

I'm getting a whirring sound when I brake heavily. Is this normal?

Also, since the new rotors are more 'grabby' than the originals, the nose of my Max is 'diving' when I brake. I think this may be due to the fact that the brake bias changed (Front to Rear) when I had the new rotors installed. I've read that the normal bias is something like 70-30 front to rear.

Any comments as to whether I'm on the right track here? I was going to get the rear stillen rotors hoping to clear up the 'diving'.


Thanks,

Craig Kam

 

Were the pads broken in properly?

Were did you get the rotors and pads, and how much did you pay?

 

is it possible for you to describe the sound a little more...there will be a new sound due to the drilling but im not sure if that's what you're getting (you probably are). also the brake bias shouldn't change...it will always be 70-30 unless the fronts are really in bad shape then the rears will do more...

 

Not having had crossdrilled rotors, I can't speak for the sound, but won't you effectively change the front to rear brake bias by changing only the fronts to higher performance rotors/pads. The pads alone are likely of differing coefficients of friction than the stock ones thus accounting for some difference in brake bias even if the master cylinder is proportioning the same amount of stock boost. I'd say the dive is likely due to this, and if you upgrade your rears as well this should even things out closer to stock dive under braking levels. I could be wrong though...my $.02 worth.

 

It'll be a few hundred miles before the noise goes away. You still have to break in the new rotor/pads.