Whenever eliminated four successive times per blend of pounds, rate, and you may highway conditions specified into the S5

(a) Getting a truck made to tow various other car equipped with sky brake system, the pressure differential involving the control line type in coupling and you will an excellent 50-cubic-inches test tank linked to the control line production coupling will perhaps not meet or exceed the values specified for the step three.5(a) (1), (2), and you can (3) underneath the requirements given for the step 3.5(b) (1) because of (4):

(1) step one psi whatsoever input demands comparable to otherwise more than 5 psi, yet not greater than 20 psi;

(2) 2 psi whatsoever input challenges comparable to or more than 20 psi yet not greater than 40 psi; and you will

(2) When air are put on otherwise create from the manage line input coupling with the truck try rig shown inside the Contour 1;

(3) Which have a fixed orifice consisting of a good 0.0180 inch diameter hole (no. 77 drill section) into the an effective 0.032 inch-thick disk strung on the handle line amongst the truck shot rig coupling together with car’s control line enter in coupling; and you can

(4) Doing work the fresh new truck shot rig in the same way and you will not as much as a similar standards because it’s run during the testing determine braking system actuation and you will launch times, because specified when you look at the 3.3 and you will 3.4, with the exception of the installation of the fresh beginning on the manage range so you can maximum ventilation price.


step 3.6 Stability and you can handle during braking – autos and you can buses. step 3.six.step one and you may 3.six.2, for every vehicle tractor should visit the very least 3 x when you look at the 12-base way, without any an element of the car leaving the latest highway. 3.six.step one and you can 3.6.dos, each coach and you will vehicle (besides a trailer tractor) are designed on otherwise after , and every shuttle and truck (other than a truck tractor) produced in several grade with the or shortly after , will take a look at the very least 3 times during the several-foot way, without having any an element of the automobile leaving new road.

step 3.6.step one Using a complete-treadle braking system application for the duration of this new end, stop the auto regarding 31 mph otherwise 75 percent of the maximum drive-thanks to price, whatever are faster, into the a four hundred-legs radius curved road with a wet level facial skin that have a beneficial top friction coefficient away from 0.5 when mentioned for the a straight otherwise rounded area of the curved highway playing with a keen ASTM E1136-93 (Reapproved 2003) (incorporated because of the site, find § 571.5) fundamental reference tire, according to ASTM E1337-90 (Reapproved 2008) (integrated by site, see § 571 escort girl Gilbert.5), at the a speed from forty miles per hour, having water delivery.

(b) Within its unloaded weight also as much as 500 pounds (also driver and you will instrumentation), or in the manufacturer’s alternative, on its unloaded pounds also to five-hundred pounds (together with rider and you may instrumentation) and you may in addition to not more than an additional a lot of weight for a beneficial roll club framework to the automobile, to own a truck, coach, or vehicle tractor.

4 Provider brakes – dynamometer tests. When looked at instead of earlier in the day road-testing, according to the requirements away from S6.dos, for every braking system assembly will be considered off 4.step one, cuatro.2, and you will 4.3 whenever checked-out in sequence and you can in the place of alterations apart from men and women given from the basic. To have purposes of the needs of 4.2 and you will 4.step 3, an average deceleration rates ‘s the improvement in acceleration split up by the the newest deceleration go out measured on start of deceleration.

Retardation push shall be computed the following:

cuatro.step 1 Braking system retardation force. The sum total retardation forces exerted because of the brakes toward for each and every vehicles designed to getting towed by another vehicle equipped with air brake system are going to be in a fashion that the new quotient sum of the fresh braking system retardation pushes / sum of GAWR’s prior to braking system chamber heavens stress, and shall keeps philosophy for around people shown inside the Column 1 regarding Dining table III.

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