Why is it important to avoid water and compressor oil in the air brake system?

Avoiding water and compressor oil in the air brake system is crucial because these substances can lead to significant damage within the system components. Water can cause corrosion, which weakens metal parts and can lead to brake failure. Additionally, moisture can freeze in colder temperatures, resulting in blockages that impair brake function. Compressor oil can contaminate the air supply, leading to the potential for sticky or malfunctioning brake valves and other components. Ultimately, the presence of these substances jeopardizes the reliability and safety of the braking system, making it essential to ensure that the air supply remains clean and free from contaminants.