Practice question

In a dual air brake system, what is the function of the 'one-way check valve' installed on the reservoirs?

To let water drain out automatically
To prevent air from flowing backward from the dry tanks to the wet tank if the compressor or supply line fails
To speed up the release of the spring brakes
To limit the pressure in the primary tank to 50 psi

Answer: B — To prevent air from flowing backward from the dry tanks to the wet tank if the compressor or supply line fails

The correct answer is shown above. Try the full quiz for additional practice.