Final answer:
If a technician measures 0.002" variation beyond the specification when measuring parallelism of a disc brake rotor, the next step would be to take corrective action to bring the rotor within the specified limits.
Step-by-step explanation:
When measuring parallelism of a disc brake rotor, if a technician measures 0.002" variation beyond the specification, the next step would be to take corrective action to bring the rotor within the specified limits. This might involve machining or replacing the rotor to ensure proper parallelism. It's important to maintain parallelism to ensure even brake pad wear and optimal braking performance.