Retardation push are determined the following:
(a) To possess a trailer designed to tow some other vehicle equipped with air brake system, the pressure differential between the control line type in coupling and you can a 50-cubic-inch try reservoir connected to the manage range efficiency coupling will not exceed the costs specified within the step three.5(a) (1), (2), and you will (3) within the conditions specified into the step three.5(b) (1) using (4):
(1) step 1 psi anyway type in pressures comparable to or higher than 5 psi, yet not more than 20 psi;
(2) dos psi at all input pressures comparable to otherwise more than 20 psi although not greater than 40 psi; and
(2) Whenever sky was applied to otherwise create from the handle line type in coupling using the truck sample rig found in the Shape step one;
(3) Having a predetermined orifice comprising an effective 0.0180 inches diameter gap (zero. 77 drill piece) from inside the a 0.032 inch thick disk hung from the control range between the trailer sample rig coupling while the vehicle’s handle range enter in coupling; and
(4) Doing work the fresh new trailer try rig in the same manner and you may significantly less than an identical criteria because it’s manage during the evaluation to measure braking system actuation and you may discharge times, since specified when you look at the step 3.step 3 and step 3.cuatro, with the exception of the installation of the fresh orifice on manage range in order to restrict airflow price.
step 3.6 Balances and you can control during the stopping – trucks and you may vehicles. 3.6.step 1 and you can step three.6.2, for each truck tractor shall visit the very least 3 x during the 12-legs way, with no part of the vehicle leaving this new highway. step three.six.step 1 and you will step three.6.2, for each shuttle and you can vehicle (besides a trailer tractor) are made to your otherwise immediately after , each bus and you may truck (except that a trailer tractor) produced in several stages on the or shortly after , will visit least three times in the twelve-ft way, without having any a portion of the auto making the brand new street.