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Question 1

50% answer correctly

Modulating control valves are used to:

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

Question 2

82% answer correctly

Air brake systems consist of which three components?

	Service, parking and emergency brakes
	Duty, parking and emergency brakes
	Standard, parking and emergency brakes
	Parking and emergency brakes

Question 3

81% answer correctly

The air compressor governor keeps the air pressure in the air storage tanks between __________ and __________ psi.