Document ID: chunk:federal_register_of_legislation:F2025C00113:front:0:p16
Version: federal_register_of_legislation:F2025C00113
Segment Type: other
Provision Reference: 
Character Range: 45383–48279

upon release of the brake control valve (V), the time between the initial pressure drop in the calibrating vessel (R2) and the pressure at the end of the calibrating vessel (R2) reaching 0.05 'E' (35 kPa), is between 0.4 and 0.5 seconds.
             1.                     Where one setting of the orifice (O) does not meet both of the above conditions simultaneously, two different settings meeting the appropriate condition can be used, one for the tests prescribed in clauses 16.4.5 and 16.4.6, and another for the test prescribed in clause 16.4.7.
 1.                           The brake control valve (V) must be of a configuration such that:
             1.           It permits energy to flow from the storage reservoir (R1) to the orifice (O) when in the "ON" position and from the orifice (O) to waste when in the "OFF" position; and
             2.           It does not allow additional energy to flow into the pneumatic test rig 'Control Line' by way of its own 'Control Signal'; and
             3.           It is designed so that the manner of its operation has no effect on the output response of the pneumatic test rig.
             1.                     The brake control valve (V) may be arranged to provide a modulated pneumatic test rig output signal for other brake development purposes, in which case this function must be rendered inoperative for the purpose of measuring response times in accordance with this clause 16.4.
 1.                           Where a rear service coupling for towed trailers is provided, the pneumatic response/release time (as applicable) must be measured with an 800-millilitre vessel (R2 in Figure 4) attached to the rear 'Control Line' coupling.
 2.                           The pneumatic test rig and the trailer energy storage devices must be charged to 1.0 'E' (650 kPa) prior to each test being conducted and no additional energy shall be added to the storage reservoir (R1) or the trailer 'Supply Line' during the period of a test.
 3.                           The brake response time must be taken from when the pressure level, measured between the storage reservoir (R1) and the brake control valve (V) initially drops, or measured at the output of the brake control valve (V) initially rises, to when the pressure in the least favoured brake actuator reaches 0.65 'E' (420 kPa).
 4.                           The response time for a rear pneumatic 'Control Line' coupling must be taken from when the pressure level, measured between the storage reservoir (R1) and the brake control valve (V) initially drops, or measured at the output of the brake control valve (V) initially rises, to when the pressure at the end of the vessel (R2) connected to the rear 'Control Line' coupling reaches 0.65 'E' (420 kPa).
 5.                           With an initial service brake application level of 1.0 'E' (650 kPa), the release time for