(b) During the option of the producer, having vehicles equipped with brake systems which incorporate a common diaphragm, the overall performance requirements given during the 6(a) and this need to be confronted by any single leakage-type of incapacity during the a common diaphragm may alternatively getting exposed to the level of leakage-variety of incapacity computed into the six.seven. 6(a) hence apply that have unmarried leakage-type failures apart from downfalls within the a common diaphragm.
S5
(c) From the accessibility to producer, brand new trailer portion of any agricultural commodity trailer, heavy hauler trailer, or pulpwood truck get meet the requirements from § regarding the label as opposed to the standards regarding 6(a).
(a) Regarding a vehicle besides a truck-tractor which is equipped with more than a couple axles, such that the quotient fixed retardation force/GAWR is not less than 0.28 for any shaft apart from an excellent steerable side shaft; and
(b) In the example of a trailer-tractor which is equipped with more several axles, such that the fresh new quotient static retardation force/GVWR is not lower than 0.14.
six.2 Stages holding. Along with vehicle parking brakes applied, the vehicle will remain stationary up against escort in Honolulu constant and you can up against downhill to your a smooth, deceased portland concrete tangible road that have a great 20-% amounts, each other
6.3.step one This new parking brakes should be ready reaching the lowest abilities given either in six.1 otherwise 6.dos with any solitary leakage-sorts of incapacity, in almost any other brakes, away from an associate made to incorporate compressed-air otherwise brake water (leaving out inability regarding a component of a brake chamber houses however, and additionally failure of every brake chamber diaphragm that is element of other brake system together with an effective diaphragm that is common to help you brand new parking brake system and any other brake system), in the event that demands on the automobile’s vehicle parking brake compartments is at the degree calculated for the six.step three.4.
Along with other brake system made inoperative, during the a fixed drawbar bring in a forward otherwise rearward guidance, the static retardation force produced by the effective use of the parking brakes shall be:
6.step 3.dos A physical mode would be so long as, immediately after a parking braking system software program is fashioned with new demands from inside the the fresh new car’s parking brake chambers from the membership determined in the six.3.cuatro, as well as sky and you will liquid challenges in the vehicle’s braking systems are next bled right down to no, and you may without the need for power, keeps the new parking brake app with enough parking retardation force to meet the lowest performance specified in 6.step three.step one along with sometimes 6.1 otherwise six.2.
6.3.step three Having cars and you can vehicles, having an initial reservoir program pressure regarding a hundred psi and you can, if designed to tow a car or truck armed with sky brakes, that have good 50 cubic inches try tank linked to the have range coupling, no later than just three seconds from the time away from actuation from the fresh vehicle parking braking system control, the newest mechanized mode described in 6.3.2 would be actuated. Getting trailers, towards likewise have line initially pressurized in order to one hundred psi utilizing the also have line portion of the truck test rig (Figure 1) and you may, in the event that built to pull a motor vehicle equipped with heavens brake system, which have a beneficial 50 cubic inches sample reservoir connected to the buttocks also have range coupling, zero later than three moments since ventilation on the surroundings of one’s side supply line coupling is established, the newest physical mode regarded for the six.step three.2 are going to be actuated. This needs will likely be met getting autos, busses and you may trailers each other that have and you will with no unmarried leaks-sorts of inability, in just about any most other brakes, from a member designed to have compressed-air otherwise braking system liquid (consistent with the parenthetical phrase given in the 6.3.1).