Question

technician a says that the discard thickness is set by how far the caliper piston can safely extend out of the caliper without damage. technician b says that lro is set by the amount of caliper piston retraction. who is correct?
technician a
technician b
both technician a and technician b
neither technician a nor technician b

Explanation:

Discard thickness is determined by the minimum safe thickness of the brake - disc for proper braking performance and safety, not by caliper piston extension. LRO (Lining - to - rotor offset) is related to the initial position of the brake lining relative to the rotor and not set by caliper piston retraction. So neither technician is correct.

Answer:

Neither Technician A nor Technician B