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Question 1

50% answer correctly

Modulating control valves are used to:

	Apply the spring and air brakes together
	Apply the spring brakes gradually
	Apply the air brakes gradually
	Switch between spring and air brakes

Question 2

76% answer correctly

For air brakes, the cut-out level is:

	The minimum air pressure for the air storage tanks
	The level at which the air compressor will start pumping air into the air storage tanks
	The level at which the air compressor will stop pumping air into the air storage tanks
	The average air pressure maintained in the air storage tanks

Question 3

43% answer correctly

For vehicles that use air brakes, emergency and parking brakes:

	Must be a combination of mechanical and air brakes
	Can only be air brakes
	Must be mechanical brakes
	Are not required