A: Suspension system (Suspension)

• Front axle & suspension
• Rear axle / tandem

B: Braking system (Braking System)

• Disc / drum brakes
• ABS / EBS (in modern models)
• Parking brake / holder

C: Drivetrain & transmission system (Drivetrain & Transmission)

• Gearbox (Manual / Automatic / AT)
• Clutch or torque converter (Torque Converter)
• Driveshaft
• Differentials and differential lock system

D: Steering system (Steering)

• Steering gearbox
• Linkages and shafts (tie rods, drag links)

E: Other auxiliary systems

• Cooling system (radiator, fan, water pump)
• Engine and transmission lubrication system