Which one of the following items is NOT included in a rear McPherson strut suspension system?

In a rear McPherson strut suspension system, the design typically features a coil spring, strut assembly, and lower control arm as primary components. The role of the McPherson strut itself combines the shock absorber and the spring into a single unit that provides structural support for the vehicle, while the lower control arm locates the wheel and allows for the necessary motion during suspension travel.

The upper control arm is not utilized in a McPherson strut setup because this system is designed without it. Instead, the upper part of the strut is attached directly to the vehicle’s body or frame, allowing for a more compact and simpler design. This is a key characteristic of McPherson strut systems, as they are engineered to provide effective handling and ride comfort while minimizing weight and complexity.

The inclusion of the lower control arm, ball joint, and coil spring are essential to the function of the strut assembly, ensuring that the wheel accurately follows the road contours, maintains proper alignment, and absorbs impacts. Therefore, the upper control arm is correctly identified as not being part of a rear McPherson strut suspension system.