(a) To own a trailer designed to pull other auto equipped with heavens brake system, pressure differential involving the manage range type in coupling and you can a 50-cubic-inches shot tank connected to the control line yields coupling should not exceed the values specified inside step three.5(a) (1), (2), and you will (3) in criteria specified within the step three.5(b) (1) compliment of (4):
(1) 1 psi anyway input pressures equivalent to or greater than 5 psi, yet not more than 20 psi;
(2) dos psi at all input challenges comparable to or greater hoofdsite than 20 psi however higher than 40 psi; and you may
(2) When air try put on otherwise put-out regarding the manage range enter in coupling utilizing the trailer shot rig found when you look at the Contour 1;
(3) That have a predetermined orifice composed of a 0.0180 inch diameter gap (zero. 77 drill bit) from inside the a great 0.032 inch-thick disc hung throughout the handle line between the trailer shot rig coupling as well as the car’s manage line input coupling; and you will
(4) Functioning new trailer try rig in the same manner and you will under the same requirements as it’s operated during evaluation determine braking system actuation and you may discharge times, given that specified into the step three.step three and you may step 3.4, except for the installation of brand new opening on control range so you’re able to limit airflow rate.
step three.6 Balances and you can handle throughout braking – cars and you may vehicles. 3.6.1 and step three.6.2, for every single truck tractor shall visit the very least 3 x in the 12-ft way, with no a portion of the auto leaving the newest street. step three.6.1 and you will 3.six.2, for every single coach and you may vehicle (other than a truck tractor) are available on the or immediately after , and each bus and you will vehicle (except that a truck tractor) manufactured in two or more values on or just after , will take a look at minimum 3 times inside the twelve-ft way, without having any the main automobile making the fresh new highway.
3.6.1 Having fun with a complete-treadle brake software for the duration of brand new prevent, prevent the automobile off 29 mph or 75 % of your restrict drive-by way of speed, any kind of try reduced, into the a 500-base radius rounded street which have a rainy height facial skin which have an excellent peak friction coefficient out of 0.5 whenever mentioned on a straight otherwise rounded area of the curved highway using a keen ASTM E1136-93 (Reapproved 2003) (incorporated from the resource, look for § 571.5) basic resource tire, prior to ASTM E1337-90 (Reapproved 2008) (integrated from the reference, see § 571.5), on a performance off 40 mph, having liquid delivery.
(b) On their unloaded weight and additionally as much as five-hundred weight (as well as driver and you will instrumentation), or within manufacturer’s solution, at the its unloaded pounds in addition to doing five hundred pounds (along with driver and you may instrumentation) and you can and only an extra 1000 pounds to own a beneficial move pub structure on vehicles, for a trailer, bus, otherwise truck tractor.
cuatro Provider brakes – dynamometer tests. Whenever checked-out instead past road testing, under the conditions of S6.2, per brake installation should qualify out of cuatro.step 1, 4.2, and you will 4.step three whenever checked in the series and without improvements except that those people given regarding the standard. For reason for the requirements of cuatro.2 and you will 4.step three, the average deceleration price is the change in speed divided of the the brand new deceleration date measured throughout the start of deceleration.
Retardation push might be calculated as follows:
4.step 1 Brake retardation force. The sum total retardation forces exerted from the brakes to your for each vehicles designed to getting towed of the several other auto armed with heavens brake system will likely be in a fashion that the quotient sum of the latest braking system retardation forces / amount of GAWR’s according to brake chamber heavens pressure, and will enjoys opinions for around those found from inside the Column step 1 away from Dining table III.