Firstly I have searched and haven't come up with the definitive answer so hence this thread.
I have also read all the reasons not to use drilled rotors. These are OEM 965tt II rotors and they are relatively cheap. In the future I will probably go for some slotted ones but I can't seem to find ones for Big Reds on a 951 either.

So do I use new or used pads? I've read about not using new pads but my used ones are going to be uneven and won't that be a bad thing when bedding in the rotors? Also how should one bed in the rotors too?

Thanks

 

Used pads on new rotors and new pads on used rotors. Visit www.stoptech.com and read the faqs for all the info.

Best,

 

I did check that link out before I made this thread Bob, but it didn't seem to take into account used pads not being flat therefore won't they adversely affect the new rotors especially if you do some decent break in procedure?
If the pad looks like ) this in cross section vs this ] is what I mean.

 

For racing applications, absolutely. Some argue modern day pad materials do not require this, transfer layer technology etc.

 

Well I'm still concerned about out of shape or not square used pads on new rotors...

 

I tend to disagree with the old advice of "old pads on new rotors". you are trying to get the new rotors friendly with the new pads and bake the new pads to get the resins out. Its a smokey, smelly afair, but is best done if you have a few laps to waste at the track. Or, on the street, you need to do about 8-10 100 - 40 mph decels at threshold braking levels. If they are not bedded properly, they will squeal and be less effective under hard braking. pretty hard to not bed them properly on the track though. 2 -3 hard laps, keeping in mind their limited effectiveness, and then 2 coold down laps and then go for it, is one of the best ways to bed your brakes.

I just bought these same 965 rotors as an upgrade to my race car with the stock calipers using some simple spacers. I bedded them using pagid blacks. they feel awesome after a few mountain and fast highway runs. . First race, March!

mk

 

This is why I am liking Performance Friction PF97's for my car...997s...PF97's and 01's do not require any bedding in. I've had many Pagid Yellows for my cars and I doubt I ever got any of the bedded in properly.

 

Yup, same with the 01's for me (and soon to the 06's for me).

 

Well it's not so much the bedding in of the pads, it's the rotors that I'm asking about. I too also liked the PFCs and will probably go back to them after these Blacks wear out but I'm worried that if I put the new rotors on with these fairly worn Blacks, that I might be doing some harm to the rotor as they are not flat or even any more.
Is this concern warranted?

 

I have always heard--and practiced--that new rotors should be only used with new pads, but that worn rotors can be used with anything. Not sure how true it is....

 

+1 also - that's what i have always heard and practiced. New with new, old rotors with new or old

 

Well you'd think that a worn rotor would wear a new pad into it's shape rather than the opposite. So by that logic I guess a worn pad shouldn't scar a new rotor?

 

I have done it all of the various ways, old with new, new with old, etc., many times over the years as dictated by circumstances. All have worked fine with proper bedding of the pads and rotors.

 

You can machine the pads down so they are even.

 

+1