Just a thought, have you checked the clearance between the rotor and the
caliper on the inside face? I don't know if it is true of the TR6, but on
the TR3 the factory used shims to center the caliper over the rotor. The
shims are a PITA to replace and so many people leave them out. The result
is that the caliper sits too far outboard by some amount. Usually not
enough to cause a problem, but maybe yours are close enough to rub, only
when the bracket deflects under hard braking or something? Hard cornering
can also move the rotor relative to the caliper (play in the bearings plus
deflection of the spindle).
-- Randall
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