If it's a stuck caliper when talking about the Brembos it would be a piston in the bore. Either debris in the system got into the bore or there is something wrong with the bore itself.
If it is on a floating caliper like the PBR's on the 4th gens or the V6 5th gens it could be all of the above plus the pins that the caliper floats/slides on could be bent or have a similar issue to the pistons.
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