Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:

Question

If water and compressor oil are left to build up in an air brake system, the system can be damaged. Air storage tanks are equipped with drains to allow this accumulation to be removed. Manually controlled drains should be operated at the end of each day of driving.

Accepted Answer

Should be removed regularly.

Answer

Are necessary for the proper function of the system.

Answer

Should take up about 10 percent of the tank.