If your pads/rotors are moving back and forth that much, it's more likely to mean that your discs aren't firmly attached to the axle. They are normally held in place by a couple of screws, but the screws tend to disappear over time. This isn't a problem, since the discs are held in place by the lug nuts/bolts when the wheels are on. However, when the wheels are off the discs flop around. Check and see if you still have the screws holding the discs in place. If not, I'll bet you can move the discs side-to-side by hand, and that's what you're seeing. Either replace the screws or temporarily screw on a couple lug nuts to hold the discs solid and the wobble will probably go away. If not, then you may actually have warped discs. But I've never seen it (in the rear) in the dozen years I've been running RX7s.
Changing the rear discs is very simple. The only possible problem is that the disc attaching screws can get rusted and cause you to strip the the center out of the phillips screw heads when you attempt to remove them(that's why they tend to disappear ). If they do, a vise grip on the edge of the screw head will usually work. If not, then you drill them out. Then you disconnect the caliper (one bolt) and remove the brake bracket (two bolts) and the disc comes right off.
I've never heard of anyone having rear brake cooling issues with an IT RX-7. I've never seen anything done beyond removal of the backing plates.
I've always used Mobil1 75/90 gear lube in my car (trans and rear axle). Works fine.
Tom Lyttle
Decatur, GA
IT7 Mazda - 2006, 2008 SARRC Champion
ITS Nissan 200SX - finally running correctly
FP Ford Capri - waiting for a comp adjustment
GT3 Dodge Daytona - what was I thinking?
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