Under what condition are drum and disc brakes rejected?

Drum and disc brakes are critical components of vehicle safety, and their performance is heavily influenced by condition. When assessing these braking systems, a rejection occurs if there is mechanical damage or a contaminated friction surface. Mechanical damage refers to any visible cracks, severe corrosion, or structural issues that compromise the integrity of the braking system. Such damage can lead to brake failure or reduced stopping power, endangering the safety of the vehicle and its passengers.

Additionally, a contaminated friction surface can severely impact the effectiveness of the brakes. Contaminants such as oil, grease, or moisture can inhibit the friction required for proper braking action. In such cases, the brakes may not function as intended, which directly affects vehicle safety. Therefore, the presence of either mechanical damage or contamination is a valid reason for rejecting the brakes during an inspection to ensure that adequate stopping power and safety are maintained.