Bus mechanics perform routine maintenance and repairs on bus fleets, usually for school districts or citywide transportation departments. You need expert-level experience working with diesel engine buses to carry out your responsibilities successfully. In this role, your primary responsibilities include inspecting the engine, brakes, and other key components to ensure that they work properly; performing oil, filter, and fluid changes; repairing and changing tires; and ordering necessary replacement parts. You also make adjustments to improve the performance of each bus. Bus mechanics usually work full-time for a bus or mechanic garage, though many are available on-call nights and weekends for emergency repairs.