Mechanic Tests - Provincial Prep

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Page 1 of 42 (0%)
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1) On an air brake system, the maximum allowable build up time for a single unit (tractor only) between 50 and 90 PSI is:
2) The main function of a highway valve is to allow:
3) An air leak from the exhaust port of a relay valve in the release position could be caused by a faulty:
4) If the trailer emergency line is severed, the trailer brakes will dynamite through the actions of the:
5) What is not included in the FMVSS 121 regulations?