(a) To own a trailer designed to tow another vehicles armed with air brakes, the stress differential between the handle range input coupling and you may a good 50-cubic-inches take to reservoir connected to the manage line production coupling should not meet or exceed the costs specified inside the step three.5(a) (1), (2), and (3) according to the criteria given for the step three.5(b) (1) courtesy (4):
(1) 1 psi after all input demands equivalent to otherwise greater than 5 psi, yet not greater than 20 psi;
(2) dos psi whatsoever enter in challenges equivalent to otherwise greater than 20 psi although not higher than 40 psi; and you may
(2) Whenever air try put on otherwise create throughout the manage line type in coupling making use of the trailer try rig shown within the Profile step 1;
(3) With a fixed beginning comprising a great 0.0180 inch diameter gap (zero. 77 bore bit) inside a great 0.032 inch-thick disk hung in the handle line between the trailer sample rig coupling therefore the automobile’s manage line enter in coupling; and you may
(4) Doing work the newest trailer sample rig in the same manner and you will significantly less than a comparable conditions as it is run through the comparison determine brake actuation and you can release times, given that specified from inside the 3.step 3 and you can 3.cuatro, except for installing brand new opening from the manage range to limitation ventilation speed.
S5
step 3.6 Balances and manage during the braking – trucks and buses. step 3.6.step one and you may step three.six.2, each vehicle tractor shall stop at the very least 3 x when you look at the 12-feet way, without the an element of the car making the fresh new street. 3.6.step 1 and 3.6.2, per shuttle and you can vehicle (except that a trailer tractor) 
were created towards otherwise shortly after , and every shuttle and you may vehicle (apart from a truck tractor) produced in a couple of amount toward or just after , will take a look at minimum 3 x in 12-ft way, without having any an element of the vehicle leaving brand new path.
3.six.step 1 Using a complete-treadle brake app during the course of the latest avoid, stop the automobile away from 31 miles per hour or 75 per cent of your own limitation drive-because of rates, any type of was quicker, into the a four hundred-legs distance curved street which have a wet height epidermis which have good height friction coefficient from 0.5 when measured on the a much otherwise curved section of the curved roadway having fun with an ASTM E1136-93 (Reapproved 2003) (integrated of the source, find § 571.5) standard reference tire, in accordance with ASTM E1337-90 (Reapproved 2008) (included of the resource, find § 571.5), at a speed of forty mph, that have h2o beginning.
(b) At their unloaded pounds and additionally to five hundred weight (also driver and you may instrumentation), otherwise at the manufacturer’s solution, at their unloaded pounds as well as up to five-hundred weight (and rider and you can instrumentation) and you can together with only a supplementary a lot of pounds to own a move pub construction into the vehicles, getting a trailer, coach, otherwise truck tractor.
cuatro Provider brakes – dynamometer testing. Whenever looked at in place of earlier in the day road-testing, beneath the conditions from S6.2, for each and every brake set-up should qualify off 4.step one, cuatro.dos, and you can cuatro.step three whenever checked in succession and you may versus modifications apart from people given about basic. Getting reason for the needs of 4.2 and you can 4.step three, an average deceleration price ‘s the improvement in acceleration separated of the the brand new deceleration time counted regarding start of deceleration.
Retardation push will likely be computed the following:
cuatro.step 1 Braking system retardation force. The entire retardation forces exerted by brake system on per auto built to getting towed of the other vehicles equipped with sky brakes will be such that new quotient amount of new braking system retardation forces / amount of GAWR’s according to brake chamber air stress, and you may should possess values no less than the individuals shown within the Column 1 off Table III.