(a) To have a trailer designed to pull another auto armed with heavens brakes, the pressure differential between the handle line input coupling and you may good 50-cubic-inch try reservoir connected to the handle line yields coupling will perhaps not meet or exceed the prices specified during the step three.5(a) (1), (2), and you can (3) in conditions given when you look at the 3.5(b) (1) as a result of (4):

(1) step one psi whatsoever input challenges equivalent to or higher than 5 psi, although not higher than 20 psi;

(2) dos psi after all type in demands equivalent to otherwise more than 20 psi but not more than forty psi; and you may

(2) Whenever sky try used on otherwise put out throughout the manage line input coupling utilizing the truck decide to try rig revealed during the Figure step one;

(3) Which have a fixed starting including an excellent 0.0180 inch diameter opening (zero. 77 bore section) during the a good 0.032 inch thick disk hung on the manage range between your truck take to rig coupling and the car’s control line input coupling; and you can

(4) Performing new truck attempt rig in the same way and you can significantly less than an equivalent conditions because it’s manage throughout the review to measure brake actuation and you may release moments, while the specified inside the step three.3 and you may 3.cuatro, apart from installing the newest orifice regarding the control line to help you restriction ventilation rate.

S5

3.six Balances and you will handle throughout the braking – vehicles and you will busses. 3.six.step one and step 3.6.2, for every single truck tractor shall take a look at least 3 times inside the 12-ft way, with no area of the car making the fresh new path. step three.six.step one and you will step 3.six.dos, for each coach and you will vehicle (aside from a trailer tractor) are available on otherwise immediately after , and every coach and you may truck (except that a trailer tractor) produced in several amounts to the or immediately following , should stop at minimum 3 x inside a dozen-legs lane, without having any a portion of the auto leaving the fresh new street.

step three.six.1 Playing with a complete-treadle braking system software during this new end, stop the auto of 30 mph or 75 percent of the limit drive-using rate, any kind of are faster, toward a four hundred-ft radius curved road which have a wet peak epidermis with good peak rubbing coefficient off 0.5 when measured with the an even or rounded part of the curved path using a keen ASTM E1136-93 (Reapproved 2003) (integrated because of the reference, select § 571.5) simple site tire, in line with ASTM E1337-90 (Reapproved 2008) (provided by site, look for § 571.5), at the a speed of forty mph, with drinking water beginning.

(b) In the the unloaded guyspy ne demek weight and additionally up to 500 lbs (plus driver and you can instrumentation), or at the maker’s alternative, from the the unloaded pounds in addition to as much as five-hundred weight (also driver and instrumentation) and you may and additionally only a supplementary a lot of weight to possess a good move bar structure on automobile, to own a truck, shuttle, otherwise truck tractor.

4 Provider brakes – dynamometer tests. When looked at without past road testing, in requirements regarding S6.2, for every braking system system shall qualify out-of 4.1, 4.2, and you will cuatro.step three when tested within the sequence and you will as opposed to modifications besides those people specified throughout the fundamental. Having reason for the needs of cuatro.dos and you may 4.3, the average deceleration speed is the change in speed split of the the deceleration day mentioned about start of deceleration.

Retardation force shall be determined as follows:

cuatro.step one Brake retardation push. The sum total retardation forces exerted by the brake system toward each auto designed to getting towed of the various other vehicles equipped with heavens brakes might be in a fashion that brand new quotient sum of new brake retardation pushes / amount of GAWR’s in accordance with brake chamber air tension, and you will shall has actually opinions no less than those individuals found within the Line 1 from Desk III.