(b) At option of producer, getting auto equipped with brake options and this need a common diaphragm, brand new efficiency requirements specified in the 6(a) and this need to be exposed to people unmarried leakage-sort of failure in a common diaphragm could possibly get instead be met with the amount of leakage-sort of incapacity calculated when you look at the 6.eight. 6(a) and that implement that have solitary leaks-types of downfalls apart from failures inside a common diaphragm.
(c) At the option of the company, brand new truck portion of people agricultural item truck, heavy hauler truck, or pulpwood trailer will get qualify away from § in the label instead of the criteria from six(a).
6.step 1 Fixed retardation push. With almost every other brakes made inoperative, through the a static drawbar present a forward otherwise rearward recommendations, this new fixed retardation push created by the usage the parking brakes will be:
(a) In the example of an automobile except that a trailer-tractor that is equipped with more a few axles, such that the quotient fixed retardation push/GAWR is not below 0.28 for any axle other than a steerable top axle; and
With parking brakes used, the car should are stationary facing constant and up against down hill towards a softer, lifeless portland cement tangible highway having an excellent 20-% amount, both
(b) In the example of a truck-tractor that’s equipped with more than one or two axles, in a fashion that the latest quotient fixed retardation hitwe chat force/GVWR is not below 0.14.
six.step three.1 The latest vehicle parking brakes might be with the capacity of attaining the lowest show specified either in 6.1 otherwise six.dos which have any unmarried leakages-type failure, in any almost every other brake system, from a member made to consist of compressed-air otherwise brake liquid (excluding incapacity from a component of a braking system chamber houses however, also incapacity of any braking system chamber diaphragm that’s section of almost every other brake system also a diaphragm that is common in order to new parking brake system and every other brake system), in the event that pressures regarding vehicle’s parking brake compartments is located at the degree determined in the 6.step three.4.
six.step 3.dos A physical mode might be provided, immediately following a vehicle parking braking system software program is created using the newest demands for the the latest car’s parking braking system chambers within profile determined for the six.step 3.cuatro, and all sorts of air and water demands about automobile’s stopping systems are upcoming bled right down to no, and without the need for electrical power, holds the vehicle parking braking system software with enough parking retardation force in order to meet with the minimum abilities specified into the six.step three.step 1 plus in possibly six.1 otherwise 6.dos.
6.3.step 3 Getting automobiles and busses, with a primary reservoir program pressure from one hundred psi and you may, if the built to tow an automible equipped with air brakes, which have good fifty cubic inch test reservoir attached to the also have range coupling, no after than simply around three mere seconds ever since from actuation out of the parking braking system handle, the brand new mechanical means referred to when you look at the 6.step 3.dos is going to be actuated. Getting trailers, to your likewise have line initial pressurized to help you a hundred psi using the likewise have line part of the truck try rig (Profile 1) and, when the made to tow an auto armed with sky brake system, that have a good fifty cubic inch attempt reservoir attached to the butt likewise have range coupling, zero later than simply three seconds from the time ventilation into the atmosphere of one’s front side have line coupling is initiated, the mechanized function described in 6.step three.2 would be actuated. Which specifications is going to be met getting autos, vehicles and you can trailers one another which have and you can without the single leakage-method of failure, in any most other brakes, away from a part built to have compressed air or braking system liquid (similar to the parenthetical terminology specified during the 6.3.1).