Water and oil _________.

Water and oil can indeed have multiple effects and require specific maintenance in air brake systems. Therefore, the correct answer is that all of the listed answers are true.

1. Water and oil can damage the brakes: If water or oil enters the brake system, it can interfere with the proper operation of the brake components, reduce braking efficiency, and potentially cause malfunctions or failures.

2. Water and oil need to be drained from the air tank at the end of each day of driving: Air tanks can accumulate moisture and oil over time. To maintain the integrity and functionality of the air brake system, it is recommended to drain the water and oil from the air tank regularly, typically at the end of each day of driving. This helps remove any contaminants and prevent potential issues.

3. Water and oil tend to collect at the bottom of the air tank: Due to their density, water and oil will settle at the bottom of the air tank. This is where they tend to collect, and if not drained regularly, they can accumulate and potentially cause problems in the air brake system.