Which of the following is NOT a component of a MacPherson strut?

A MacPherson strut is a type of suspension system commonly used in vehicles. It is designed to support the vehicle's weight while allowing for wheel movement and handling dynamics. The primary components of a MacPherson strut include:

1. Strut Assembly: This consists of the strut itself, which is like a shock absorber but includes a spring that provides support. The strut coil or spring is crucial in managing load and dampening road vibrations.

2. Lower Control Arm: This is a critical component that connects the vehicle's body to the wheel assembly, allowing for controlled wheel movement during various driving conditions.

3. Steering Arm: This component connects the steering mechanism to the wheel assembly, enabling the driver to steer the vehicle efficiently.

The trailing arm, however, is not a component of the MacPherson strut system. It is typically associated with a different type of suspension setup, such as multi-link or trailing arm suspension systems, which function to provide additional support and stability but operate differently than the strut design. This distinct functionality of the trailing arm confirms that it does not belong to the MacPherson strut assembly.