(b) At option of 
the company, to have vehicle armed with brake expertise hence incorporate a familiar diaphragm, this new performance standards given from inside the 6(a) which should be confronted with any single leakages-variety of incapacity in a familiar diaphragm get as an alternative be exposed to the level of leakages-types of incapacity computed from inside the 6.seven. 6(a) which incorporate that have single leakages-sorts of disappointments besides downfalls from inside the a common diaphragm.
(c) During the accessibility to the company, this new trailer part of people agricultural commodity truck, heavy hauler truck, otherwise pulpwood truck get be considered regarding § associated with identity instead of the conditions out of 6(a).
S5
six.step 1 Fixed retardation force. With all of most other brakes made inoperative, through the a fixed drawbar bring in an onward otherwise rearward assistance, the newest fixed retardation force produced by the usage the brand new parking brakes will likely be:
(a) In the case of an automobile besides a truck-tractor which is equipped with over a couple of axles, such that the latest quotient static retardation force/GAWR isn’t less than 0.28 when it comes to shaft besides good steerable top shaft; and
It requirements can be satisfied to have vehicles, busses and you can trailers both having and you will without any unmarried leakages-sorts of failure, in any other brakes, from a member designed to incorporate compressed air otherwise braking system water (similar to the parenthetical terminology given into the six
(b) In the case of a trailer-tractor which is armed with over a few axles, such that the quotient static retardation push/GVWR is not less than 0.fourteen.
6.dos Grade carrying. Along with parking brakes applied, the automobile will continue to be fixed up against constant and you can facing downhill to your a mellow, dead portland cement concrete road that have a 20-% values, both
6.step 3.step one The fresh vehicle parking brakes would be with the capacity of achieving the lowest efficiency given in both 6.step one otherwise six.dos having people solitary leakage-variety of failure, in virtually any other brake system, out of a member made to include compressed air or brake liquid (leaving out incapacity regarding an element of a braking system chamber houses however, and failure of every brake chamber diaphragm that is section of almost every other brakes in addition to a good diaphragm that is preferred so you’re able to brand new parking brakes and every other brakes), if challenges throughout the automobile’s vehicle parking brake chambers is at the levels computed when you look at the six.step 3.4.
6.step three.dos A mechanical setting are provided, immediately after a parking braking system software is made out of new demands during the the brand new vehicle’s vehicle parking brake spaces in the membership determined inside six.3.4, and all sorts of heavens and you may liquid demands about vehicle’s braking systems are next bled down seriously to zero, and you may without needing electrical power, keeps new parking brake software with plenty of vehicle parking retardation force so you can meet the minimal abilities given within the six.step three.step one plus in both six.1 otherwise six.2.
6.step 3.step 3 To possess vehicles and you can busses, that have a primary reservoir program stress away from 100 psi and you can, if built to tow a car equipped with heavens brake system, having a great 50 cubic inches attempt tank connected to the supply range coupling, no later than simply about three moments from the time away from actuation out-of the brand new parking brake handle, the newest technical function referred to in the six.3.2 might be actuated. Having trailers, with the also provide line 1st pressurized in order to 100 psi utilising the have range part of the truck shot rig (Figure step one) and, in the event the made to tow a vehicle armed with air brake system, having a beneficial 50 cubic inches sample reservoir connected to the butt likewise have line coupling, no later on than simply about three mere seconds since ventilation toward atmosphere of one’s side have range coupling is set up, the new mechanized function regarded during the six.step three.dos would be actuated. step three.1).