ASE School Bus Technician Brakes Certification (S4) Practice

The allowable threshold for cleaning contamination off of brake linings being ten percent is based on industry standards for ensuring optimum brake performance and safety. Brake linings are critical components that provide the necessary friction to slow down or stop a vehicle. Maintaining their integrity is essential.

Cleaning brake linings of contamination, such as oil, grease, or dust, must be done carefully to ensure that the effective friction material is not compromised. A limit of ten percent contamination allows technicians to ensure that the brake's efficiency and effectiveness are maintained while still enabling some degree of maintenance. Exceeding this percentage could lead to reduced braking performance, increased wear, and potential safety hazards.

As contamination levels increase beyond ten percent, the likelihood of brake failure or diminished performance rises, which is why this threshold is crucial for maintaining safe operation in school buses or other vehicles.