Repair and/or rebuild brake systems, steering components and suspensions; replace brake shoes and pads; turn drums and rotors on a brake lathe; rebuild master cylinders and wheel cylinders; repair brake lines, hoses and power booster; maintain and overhaul air brake systems to include air compressor, governor, reservoirs, air dryers, control valves, and actuators; update obsolete systems to meet current regulations and requirements; repack cylinders or rebuild power steering pumps; repair or replace tie rod ends, drag links, idler arms, and ball joints; adjust sleeves, king pins, and spindles; repair or replace springs, pins, bushings, axles, spring shackles, mounts and shocks. Repair diesel and gasoline powered engines; check, adjust and calibrate engines to original performance level; replace injectors; adjust valves; inspect and replace filters; check pressures; disassemble and clean external and internal parts for inspection; grind valves; repair cylinders, pistons, crankshafts, camshafts and connecting rods; replace bearings; reassemble engine and/or components; test complete engine or components through a road test and/or use of a dynamometer.