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Paul,
Yes the tolerances are very tight. Unfortunately the tolerances on the rims are not so tight. This is further compounded by our customers wanting the biggest rotors they can get. The original rear rotor diameter is 11.2 and we are now using an 12.2 inch rotor. This helps in braking performance; but makes the brake package very tight.
If the e-brake caliper is left on and driven in reverse, the rotor torques the e-brake caliper out far enough that it can then catch on the rim. This in turn tweaks the caliper out enough so it will drag on the rim.
You will need to loosen the caliper just a little bit and tweak the caliper back. Of course you will then need to retighten your caliper. You will also need to dress up the caliper arms.
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