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The air loss rate on a towing vehicle with two or more trailers must not exceed: a) 28 kPa (4 psi) per minute. b) 41 kPa (6 psi) per minute. c) 55 kPa (8 psi) per minute. d) 7 kPa (1 psi) per minute. {Ans: b) 41 kPa (6 psi) per minute.}When inspecting the foundation brake components, the driver must look for: a) brake lining that is not against the drum when brakes are applied. b) brake lining that is too thin or cracked. c) grease or oil on the brake lining. d) all of the above. {Ans: d) all of the above.}When a low air pressure warning device activates, the driver must: a) drive the vehicle until brakes come on automatically. b) come to a safe stop as soon as possible. c) replace the warning device. d) drain the moisture out of the supply (wet) tank. {Ans: b) come to a safe stop as soon as possible.}A tractor protection valve: a) causes towing vehicle spring brakes to apply in an emergency. b) prevents loss of air out of the towing vehicle. c) causes the trailer service brakes to apply in an emergency. d) prevents air loss