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I get slotted rotors from another source, in Canada, and they come with a set of "break-in" instructions; also, the pads I get, PBR Deluxe from IPD, also has instructions on the box; and they're almost the same, so I'll offer what these suggest, paraphrasing to merge the two instructions into one:
Basically, they agree to (right after installation) initially do a series of stops like this:
1) drive the car upt to about 20 to 30 mph and using "moderate" application of the brakes come to an almost complete stop" (but actually keep rolling, do not fully stop), then promptly accelerate again ...
2) repeat this five to ten times in quick succession (the variation is from the two different sources -- I always do the larger number).
3) and finally promptly park the car [and from other sources, try not to use much braking for this; stopping using the parking brake I've heard is ideal] and do not use the car again until after the brakes have fully cooled (or, wait 2 to 3 hours at least).
Apparently, both manufacturers (the rotors' and the pads') want you to heat up the rotors and pads (by repeated moderate braking), and then let them cool completely -- all in essentially one complete heat-cool cycle. And I understand that the reason for not coming to a complete stop during the heating process is to avoid transferring too much pad material to the rotor in just one spot (under the stationary pad), which will create a high spot that can eventually lead to vibration. Likewise my advice (from other sources) to avoid hard use when parking) is to likewise avoid transfer of pad material in one spot, until the heat-cool cycle is completed.
Well, that's it for what it's worth. Good luck.
BTW, also, just curious, but am I right to assume, by "ATE slotted", you mean the PowerDisks? That is, two roughly triangular patterns of a continuous slot, overlapping to form a six-pointed (rounded point, that is) star?
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