A truck parts diagram is easiest to read in four zones rather than one long alphabetical list: cab and body, chassis and drivetrain, air brake and air supply, and trailer coupling. Nearly every naming problem comes from the same component carrying two or three common labels, so the drawing tells y... read more
A lorry that comes into the workshop with a slipping clutch is rarely suffering from one fault. More often the disc has been slipping quietly for weeks, the release bearing is dry, and a tired booster has been masking the first two. A lorry clutch is the friction coupling between the engine flywhe... read more
A truck brake system is the network of air-powered components that turns pedal input into controlled stopping force at every wheel: compressor, air dryer, reservoirs, valves, brake chambers, slack adjusters and the foundation brake itself. If you want the short answer first, most stopping faults o... read more
Choose a trailer brake chamber by specification, not by photograph. Match three things — the mounting and port style, the rated stroke, and the diaphragm area the axle actually needs — and the chamber will run for years. Miss one of them and you get dragging brakes, longer stopping distances, or a... read more
A Volvo VNL uses a long-stroke piggyback spring brake chamber on the drive axle and a smaller service chamber on the steer axle, and the two are never interchangeable. On a VNL with rear drum brakes, the drive-axle unit is normally a type 30/30 spring brake with a 3 in. (76 mm) nominal stroke; the... read more
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