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which of the following is okay to find in the air brake system a oil B air sea water D all of the above answer B air loss in a single vehicle not a combination unit should not be more than underscore with the engine off and the brakes on a 1 PSI in 30 seconds b 1 PSI in one minute C 2psi in 45 seconds D 3 PSI in one minute answer D 3 PSI in one minute the vehicle must have a warning device which comes on when the air pressure in the service air tanks Falls below a 40 PSI B 50 psi C 60 PSI d adpsi answer C 60 PSI if the air system should develop a leak what will keep air in the air tanks a the governor B the tractor protection valve C the emergency relay valve D the one-way check valve answer D the one-way check valve which brake system applies and releases the brakes when the driver uses the brake pedal a the emergency brake system B the service brake system C the parking brake system d none of the above answer B the service brake system when using the parking brakes or emergency brake
