I switched from carbotech XP9 to Axxis Ultimate when I went to AutoX after roadcourse days. The brake performance decreased significantly and ended up driving through bunch of cones where hard braking needed..It continumed until I drove out to back street and bed them in again.
It should be the matrials b/w two pads. Brake experts even advise to remove the old pad layer on the rotor before bedding the new/used(bedded before) pads.

 

This is what I was thinking. The material transferred to the rotor is likely a derivative or subcomponent of the material in the pad, and so it may be the same from pad to pad assuming the pad compounds are not too dissimilar.

Jonam, going from street to race pads should not be a problem because, when cold initially, they are so abrasive that they probably take off any OEM pad material (or any type?) that's been on the rotor. So I am guessing that new material is transferred as the brakes get hot and after a few hard brakings.

I'm no brake expert so all this is conjecture.

I have found that going from Cobalt VR front/Hawk blues rear back to OEM that the bite is much stronger, but maybe it's just temporary and I don't drive hard on the street to know if it eventually deteriorates t worse that OEM to OEM.

 

I agree on "from street to race" case and that has been my expereince, too.

As to "from race to street", I did not notice it at all until I actually needed a hard braking.. just an obseravation.

 

That's what I was getting at in my earlier post. If I understand it correctly, the Carbotech and Axxis pad compounds are completely different and likely incompatible. You have to take all these things on a case-by-case basis and find out what works for you.

 

i see

 

very excellent indeed.

 

Before I install new pads I put them in a preheated toaster oven (outside) and bake @ 400' for 30 min. Unplug oven and let cool down. DO NOT open oven door until cool as ambient air temp. will cool pads too quickly making pads brittle. This process helps to outgass the pads so breakin is quicker.

 

Read instructions in Colbalt brake pad box. That worked for me.

 

Any funny taste to your food since then?