Red Seal Truck and Transport Mechanic Practice Exam

Which part of a truck’s suspension system absorbs road shocks?

1. Springs

2. Steering wheel

3. Shock absorbers

4. Wheel bearings

The correct answer is: Shock absorbers

In a truck's suspension system, shock absorbers play a crucial role in absorbing road shocks. They are designed to dampen the oscillations produced by the vehicle's springs as they compress and decompress over bumps or uneven surfaces. When a truck encounters a pothole or rough terrain, the springs will compress and absorb some of the initial impact, but without shock absorbers, the springs would continue to bounce up and down excessively. This oscillation could lead to an uncomfortable ride and compromise vehicle control. Shock absorbers work by converting the kinetic energy of the spring movement into heat, which is then dissipated. This process significantly improves ride quality and stability, enhancing both the comfort for passengers and the control of the vehicle, especially under load or during braking. In contrast, springs are essential for supporting the weight of the vehicle and facilitating vertical movement, but they do not manage oscillation. The steering wheel is part of the steering system and does not function in shock absorption. Wheel bearings are crucial for reducing friction between the wheels and the axle but have no role in absorbing road shocks.