Tune-up mechanics adjust the ignition timing and valves, and adjust or replace spark plugs and other parts to ensure efficient engine performance. They often use electronic test equipment to help them adjust and locate malfunctions in fuel, ignition, and emissions control systems. Front-end mechanics align and balance wheels and repair steering mechanisms and suspension systems. They frequently use special alignment equipment and wheel-balancing machines. Brake repairers adjust brakes, replace brake linings and pads, repair hydraulic cylinders, turn disks and drums, and make other repairs on brake systems.
Some mechanics specialize in both brake and front-end work.
Automotive-radiator mechanics clean radiators with caustic solutions, locate and solder leaks, and install new radiator cores or complete replacement radiators. They also may repair heaters and air-conditioners, and solder leaks in gasoline tanks. Generally, automotive and motorcycle mechanics work indoors. Most repair shops are well ventilated and lighted, but some are drafty and noisy. Mechanics frequently work with dirty and greasy parts, and in awkward positions, they often must lift heavy parts and tools.