This best-selling introduction to servicing medium-and heavy-duty trucks continues to provide a strong foundation of content on Electricity and Electronics, Power Train, Steering and Suspension, Brakes, and Accessories Systems. The Fourth Edition has been technically updated and restructured to address 2004 compliance issues and Out Of Service (OOS) criteria. Heavy Duty Truck Systems, Fourth Edition also features a dedicated chapter on multiplexing with special focus on the Freightliner M2 and Navistar Diamond Plus systems, as well as new material introducing simple truck hydraulic circuits in a user-friendly manner. Other enhancements include improved coverage of transmissions to address changing technologies, and an expanded chapter on electronically automated transmissions that includes emerging Meritor and Mercedes-Benz transmissions, and also explores the currently popular anti-rollover protection electronics.