Air brake systems utilize compressed air to actuate braking mechanisms, primarily on heavy-duty trucks and trailers. Core components include an air compressor, reservoir, and control valves to supply and regulate air pressure to brake chambers at each wheel end. These chambers convert air pressure into mechanical force, applying the brakes via pushrods. System integrity relies on components like air lines, fittings, and quick-release valves to maintain pressure and facilitate rapid response. Modern systems often incorporate ABS, traction control, and electronic stability programs integrated with the air brake circuitry for enhanced safety and control.