5. Shut-off valves (also called "cut-out cocks") are used in the service and supply air lines at the back of trailers used to tow other trailers. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. 0000006383 00000 n How much space should be between the upper and lower fifth wheel? When checking the fifth wheel, you should make sure that it has enough? Pull gently against them in a low gear to make sure the brakes work. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. A Open, latched B Open, free C Closed, latched D Closed, free 28. weather passes. We have a new version of this program. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. B. closed In double and triple trailers, the trailer air supply control should pop or _________ when air pressure drops into the range of 20 to 45 psi. Charge the system and pump the brakes with the window down. symptoms of a bad fuel tank selector switch. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. There is a school zone ahead. Make a sketch that explains this phenomenon in terms of a feedback loop . Converter dollies: 0000001107 00000 n to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. Locking jaws closed on 0000008187 00000 n A. closed; latched B Often do not have spring brakes The converter dolly air tank drain valve on coupled double/triple trailers should be: You are driving a 100-feet truck with double trailers at 50 mph. D open, closed, closed: Term. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes.

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