What will result in a vehicle being rejected based on self-adjusting slack adjusters?

A vehicle will be rejected based on self-adjusting slack adjusters if any slack adjuster was replaced with a non self-adjusting one after a certain date because this violates regulations concerning braking systems in commercial vehicles. The intention behind this regulation is to ensure that vehicles equipped with automatic slack adjusters maintain their safety and efficacy in braking. Self-adjusting slack adjusters are designed to maintain proper brake adjustments automatically, which is crucial for the braking performance of heavy vehicles. Using a non self-adjusting slack adjuster compromises this function, potentially leading to uneven brake wear and reduced stopping power. This requirement emphasizes the importance of adhering to specific component standards that have been established to enhance safety on the road.