Ace Your DMV Written Test with our Guaranteed Cheat Sheet.
Cheat sheet
What is often found in compressed air?
A.  Water
B.  Cardboard
C.  Brake fluid
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.
Answer Statistics
2.39 % of our users get this question wrong.
This questions is relatively Easy

Pass your DMV Written Test with flying colors

Ace Your DMV Written Test
Get your Cheat Sheet Now!