What could be a result of inadequate brake adjustment?

Answer: D — Potential brake failure

Inadequate brake adjustment can lead to potential brake failure, which is a serious safety concern for any vehicle, especially combination vehicles. When brakes are not properly adjusted, they may not apply the necessary force to stop the vehicle effectively. This condition can result in a longer stopping distance or even a complete inability to stop when needed, which could lead to accidents or collisions. Moreover, if brakes are not properly maintained, they may wear unevenly or excessively over time, worsening their performance. The risk of brake failure is compounded in combination vehicles due to their weight and the additional challenges that come with driving larger vehicles, making it crucial to ensure that brakes are always in optimal condition. Regular inspections and adjustments are essential to maintain safety and reliability on the road.