New selection of decelerations shall be held as follows:

New selection of decelerations shall be held as follows:

cuatro.dos Brake electricity. Whenever attached to an inertia dynamometer, for each and every braking system should be able to make 10 successive decelerations at the typical rates out of 9 f.p.s.p.s. from 50 meters.p.h. to help you fifteen m.p.h., during the equivalent periods away from 72 moments, and you will would be capable of decelerating so you’re able to a halt of 20 yards.p.h. in the an average deceleration rates out of fourteen f.p.s.p.s. one minute adopting the tenth deceleration.


cuatro.dos.step 1 Having an initial braking system heat anywhere between 150 °F. and you can 200 °F. on earliest braking system application, in addition to drum or disc rotating during the a speed comparable to 50 meters.p.h., apply this new brake and you can slow down at the an average deceleration rate off 9 f.p.s.p.s. to help you 15 m.p.h. Abreast of interacting with fifteen yards.p.h., accelerate so you’re able to fifty m.p.h. and implement the new braking system to have an extra date 72 moments immediately after the beginning of the initial app. Repeat the years until 10 decelerations were made. The service line heavens pressure shall perhaps not exceed a hundred psi throughout the people deceleration.

The service line air stress needed to for a speeds from twelve f

cuatro.2.2 A second following prevent of one’s history deceleration needed from the 4.2.step one and with the musical instrument or disk rotating within an increase off 20 m.p.h., decrease so you can a halt in the the average deceleration price out-of 14 f.p.s.p.s.

cuatro.step 3 Braking system recovery. Except as offered in the cuatro.3(a) and you can (b), creating one or two minutes immediately after finishing the newest evaluation necessary for 4.dos, an excellent vehicle’s braking system shall be capable of making 20 successive comes to an end of 31 mph at the common deceleration price from 12 f.p.s.p.s., during the equivalent intervals of a single minute mentioned right away regarding for every single brake software. p.s.p.s. is not more than 85 lb/in 2 , and never lower than 20lb/in 2 having a braking system perhaps not susceptible to the brand new control of an enthusiastic antilock system, or 12 lb/in two to have a brake susceptible to new command over a keen antilock program.

(b) In spite of cuatro.step three, none front side axle brake from a shuttle or a truck almost every other than a trailer-tractor are at the mercy of the requirement set forth within the 4.step 3 prohibiting the service line heavens stress out of becoming lower than 20 lb/in two to possess a braking system maybe not at the mercy of the new command over a keen antilock system otherwise a dozen lb/in 2 to own a braking system susceptible to the fresh new control over an antilock system.

5.step 1 Antilock system dysfunction. On a trailer tractor are produced into otherwise immediately following February 1, 1997, which is armed with an enthusiastic antilock brake system and you can just one device auto are built on otherwise immediately after March 1, 1998, which is armed with an antilock brake system, a malfunction that impacts the fresh new generation or alert off impulse or manage signals of any area of the antilock program should perhaps not improve actuation and you may launch times of the service brakes.

5.dos Antilock system strength – trailers. With the a truck (and a truck converter dolly) are manufactured towards otherwise after March step one, 1998, that is armed with an enthusiastic antilock program that really needs electrical power to have process, the benefit should be extracted from the brand new towing automobile owing to you to definitely or maybe more electric circuits which provide proceeded strength as soon as the pushed car’s ignition (start) key is within the “on” (“run”) condition. Brand new antilock program will instantly located stamina regarding the stoplamp circuit, whether your first routine otherwise circuits are not doing work. Per trailer (together with a truck converter dolly) are manufactured with the or once February 1, 1998, which is furnished so you’re able to pull other heavens-braked auto will likely be equipped with one or more circuits and that give persisted capability to brand new antilock system on auto(s) they tows. Such as circuits will be enough to let the antilock system to the per towed vehicle become completely operable.

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