How can brake efficiency be negatively impacted?

Brake efficiency can be negatively impacted by worn brake linings and excessive slack for several reasons. When brake linings wear down, they become less effective at creating the necessary friction required to slow down or stop a vehicle. This wear directly reduces the braking power because the linings are not able to engage the brake drum or disc effectively.

Excessive slack, usually found in the brake linkage or adjustment systems, can also hinder performance. When there's too much slack in the system, the movement of the brake pedal does not translate effectively into brake engagement. This results in a delayed response or a weaker braking force, further compromising efficiency and safety.

Together, these factors significantly reduce how well the braking system can operate, making it critical to maintain brake components in good condition to ensure optimal braking performance.