Answer :
Both technicians are partially correct: 'on-car' brake lathes can machine rotors on the vehicle, but it's standard and safer to machine drums off the vehicle with a 'bench' brake lathe.
In the scenario regarding brake lathe use on a vehicle, both Technician A and Technician B have partially correct statements.
Technician A is incorrect as there are indeed brake lathes designed to machine rotors while they are still installed on the vehicle; these are known as 'on-car' brake lathes.
However, Technician B is correct in saying that drums must be removed from the vehicle to be machined.
It's common and safer practice for drums to be machined off the vehicle with a 'bench' brake lathe.
Learn more about Brake Lathes here:
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