What should be done if more than one-fourth of a spring leaf is broken?

Answer: B — Deadline the vehicle

If more than a quarter of a spring leaf is broken, it is essential to deadline the vehicle. This action is taken because a broken spring leaf significantly compromises the vehicle's suspension system, affecting its stability and handling. The suspension system is responsible for maintaining tire contact with the road, providing a smooth ride, and ensuring the vehicle can effectively manage loads. If a spring leaf is damaged, it can lead to uneven tire wear, decreased ride comfort, and potential loss of vehicle control, which can pose serious safety risks. By taking the vehicle out of service, you prevent further damage and ensure the necessary repairs can be made to restore the suspension system's integrity before the vehicle is driven again.