Yet not, people agricultural product trailer, hefty hauler truck, or pulpwood truck should be considered away from S5
eight.2 Emergency brakes process. This new emergency brakes are applied and you may put out, and stay with the capacity of modulation, as this service membership brake control.
(a) When it comes to a trailer-tractor in the unloaded standing and a single product vehicle hence can perform pulling an airbrake equipped auto and that is stacked to GVWR, are able to appointment the needs of 7.1 from the procedure of 
solution brake manage merely, to your trailer air also have range and you can heavens manage line out of brand new towing car ventilated into environment in line with S6.step 1.14;
S5
(b) Be capable of modulating the atmosphere regarding likewise have otherwise manage range for the truck in the shape of this service membership braking system handle having an individual inability regarding pulling vehicles solution brakes as the given from inside the seven.step one.
8.1 Emergency braking capability. For every single truck other than a truck converter dolly should have a beneficial vehicle parking brakes that adapts in order to 6 and this enforce that have the fresh force given in 6.step 1 otherwise 6.2 in the event the sky pressure from the also have line is at atmospheric pressure. A truck converter dolly shall has, on maker’s option –
(a) A parking brakes that adapts so you can 6 and therefore is applicable for the push specified inside six.step one otherwise six.2 in the event the air tension regarding also provide line was at atmospheric stress, or
(b) An urgent situation program one instantly applies the service brakes in the event that services reservoir was at one stress above 20 pound/in 2 and the also have line is at atmospheric pressure. 8.step 1 or, at accessibility to the company, the requirements of § with the label.
8.2 Also provide line stress maintenance. People unmarried leakages sorts of failure on solution brake system (with the exception of weak of the likewise have range, a valve truly linked to the also provide line or a feature off a braking system chamber construction) shall maybe not result in the stress regarding the also provide line dropping below 70 psi, measured within pass truck supply coupling. A trailer will meet the above also have range stress retention requirement with its brake system linked to the truck shot rig shown inside the Contour step 1, to your reservoirs of your own truck and try rig 1st pressurized to help you one hundred psi additionally the regulator of the truck try rig set during the 100 psi; other than a truck equipped with an atmosphere-applied, mechanically-stored vehicle parking brakes and not designed to tow a car or truck equipped with heavens brake system, on maker’s choice, get meet the requirements regarding 8.cuatro unlike the ones from 8.dos and you can 8.3.
8.step 3 Automatic application of vehicle parking brakes. That have an initial tank program stress off a hundred psi and you will very first also provide range pressure regarding 100 psi, of course, if made to tow an auto equipped with sky brakes, having a 50 cubic inch try reservoir linked to the butt also provide line coupling, sufficient reason for one further unmarried leakages particular inability in every most other brake system, away from a part made to have compressed-air otherwise braking system liquid (consistent with the parenthetical words given in six.step 3.1), once the sky pressure in the likewise have line was 70 psi or maybe more, the fresh new vehicle parking brakes will maybe not give one braking system retardation once the a good outcome of complete otherwise partial automated application of this new parking brake system.
8.4 Automated application of air-used, automatically held parking brake system. With its brake system linked to the have range part of the fresh truck test rig (Profile 1) therefore the regulator of one’s trailer attempt rig place within one hundred psi, with people single leaks types of inability throughout the services brake system (with the exception of failing of your own supply range, a valve directly connected to the also have line or an element out-of a brake chamber, however, along with failure of every common diaphragm), the newest parking brakes shall perhaps not offer any braking system retardation given that an excellent outcome of over otherwise limited automatic application of the brand new vehicle parking brake system.
