The Fundamentals of Medium/Heavy Duty Commercial Vehicle Systems Tasksheet Manual, Second Edition, is designed to guide students to meet Master Truck Service Technology (MTST) requirements for Automotive Service Excellence (ASE) Medium/Heavy Truck certification. Organized by ASE topic area, companion tasks are grouped together for more efficient completion and are clearly labeled with MTST task numbers, ASE priority levels, and CDX tasksheet numbers. This manual will assist students in demonstrating hands-on performance of the skills necessary for initial training in Medium/Heavy Truck Systems repair. It can also serve as a personal portfolio of documented experience for prospective employment. KEY FEATURES List of required materials and equipment for each task Critical safety considerations relevant to each task Time card feature allowing students to track the time they spend on each task Evaluation criteria with instructor sign-off for each task A correlation guide cross-referencing the tasks with their MTST task numbers.