6.eight.2.1 According to the following the processes, determine the fresh new endurance number of prominent diaphragm leakage-sorts of inability (or equivalent level of leakage in the sky chamber who has that diaphragm) from which the fresh automobile’s vehicle parking brake system getting unreleasable. Which have an initial reservoir program and offer range stress from a hundred psi, no application of any of the automobile’s brake system, and you can, if the auto is made to tow an auto equipped with heavens brakes, a great 50 cubic inch sample tank attached to the likewise have range coupling, establish an excellent leakage-type of inability of one’s prominent diaphragm (or equivalent leakages from the air chamber containing you to definitely diaphragm). Pressurize the supply line by linking the trailer’s front likewise have line coupling to the supply range portion of the trailer try rig (Contour step one) towards regulator of your own trailer test rig place within one hundred psi, and watch whether or not most of the mechanical mode described into the six.step three.dos will always be actuated and keep the vehicle parking brake programs with sufficient parking retardation pushes in order to meet minimal efficiency given in both six.step one or 6.2. Try this processes with increasingly coming down otherwise growing account (whichever is applicable) regarding leaks-sort of diaphragm disappointments or comparable leaks, to select the minimal amount of prominent diaphragm leaks-form of failure (or similar number of leaks regarding heavens chamber with you to diaphragm) where every mechanized mode known into the six.step 3.2 will still be actuated and you may support the parking brake applications with sufficient vehicle parking retardation pushes meet up with minimal performance specified in a choice of six.1 or six.2.
Make a parking braking system application by the ventilation leading likewise have range coupling on conditions, and relieve the new demands in every of one’s vehicle’s reservoirs in order to zero
6.seven.2.dos From the number of preferred diaphragm leaks-sort of inability (or similar amount of leakages from the heavens chamber containing you to diaphragm) computed during the six.seven.2.1, and making use of the following procedure, determine this new endurance limitation tank leaks rates (inside psi each minute). Which have a primary reservoir program and provide range stress away fruzo from 100 psi, zero applying of the automobile’s brake system and you can, in case your vehicle is designed to tow a car armed with air brakes, a great fifty cubic inch sample tank linked to the bottom also provide range coupling, generate a vehicle parking brake application of the ventilation the front also provide range coupling with the environment. Determine the utmost tank leakages speed (inside the psi per minute), which is the restriction rate away from reduced total of heavens stress out of all car’s reservoirs you to results then parking brake software.
six.eight.2.3 By using the following process, a beneficial leaks-particular failure of your preferred diaphragm (or comparable leakage on air chamber that contains one to diaphragm) one causes an optimum tank leaks speed that’s three moments the fresh tolerance restrict reservoir leakage rate calculated inside 6.eight.2.2. That have a first reservoir system and provide line stress out of 100 psi, zero applying of any of the vehicle’s brakes and you may, if for example the vehicles was designed to pull an auto armed with air brake system, an effective fifty cubic inches try reservoir connected to the bottom also have range coupling, create a vehicle parking brake app of the ventilation the leading likewise have range coupling on conditions. Determine the maximum reservoir leakages rates (inside psi each minute), which is the restriction rate away from decrease in heavens tension away from any of the automobile’s reservoirs one to overall performance after that parking braking system software. The level of preferred diaphragm leakages-sort of inability (or comparable amount of leakages regarding the air chamber who has one to diaphragm) on the this tank leakages speed is the peak which is for usage within the solution set forth during the six(b).
eight Emergency brakes getting autos and busses. step 1, adapts into the conditions from seven.step one thanks to 7.3. However, this new vehicle portion of a car or truck transporter shouldn’t have to meet the test drive criteria from seven.step one and you can seven.step 3.