Diagnosis, inspection, installation, disassembly andâ¯cleaning of components such as:â¯brakes, suspension, tires,â¯bearings, seals, radiators, water pumps, coolant hoses, alternators, regulators, steering components, oil/air filters, door assemblies, controls, seats, belts, electric motors, pneumatic valves, cables, and linkages.â¯. Class B Mechanics will assistâ¯Aâ¯Levelâ¯Mechanics with skilled workâ¯and train/supervise C Level Mechanics.