What condition should linings be in during a pre-trip inspection?

Linings should be in a satisfactory condition during a pre-trip inspection to ensure safe operation of the vehicle. Specifically, they must have no cracked, broken, or missing parts. This is essential as any damage to the linings can significantly affect the vehicle's braking performance and overall safety on the road. A compromised lining may lead to inefficient braking, which can result in dangerous situations.

While thickness is important for safety, the specific requirement is not solely about being less than a certain measurement or showing signs of wear; instead, the integrity of the linings is paramount. Additionally, there is no requirement for linings to be painted for visibility, as this does not contribute to their functional safety but could instead be misleading if the linings are not structurally sound regardless of their appearance.