Rbt ..
A very little lateral movement relative to the rotor is going to be OK, Rotational movement isn't. Ideally you'd have none of either unless you have a floating caliper where you should only have lateral.
Lateral movement makes allowance for tolerances in build, if it wasn't there you'd be having to shim the caliper/rotor.
The caliper can also take out a little lateral offset but you want this to be as small as poss.
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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