Document ID: chunk:federal_register_of_legislation:F2025C00113:front:0:p17
Version: federal_register_of_legislation:F2025C00113
Segment Type: other
Provision Reference: 
Character Range: 48034–51064

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 a rear pneumatic 'Control Line' coupling must be taken from when the pressure level measured between the brake control valve (V) and the orifice (O) initially drops, to when the pressure at the end of the vessel (R2) connected to the rear 'Control Line' coupling reaches 0.05 'E' (35 kPa).
 1.                                 Electronic response time measurement
     1.                           The trailer 'Supply Line' and 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 trailer 'Supply Line' during the period of a test.
     2.                           An electronic simulator must be used to produce a digital demand signal in the electric 'Control Line' according to ISO 11992‑2:2003 and its Amd.1:2007 and must provide the appropriate information to the trailer via pins 6 and 7 of the ISO 7638:2003 connector.  For the purpose of the response time measurement, the simulator may at the manufacturer's request transmit to the trailer information that no pneumatic 'Control Line' is present and that the electric 'Control Line' demand signal is generated from two independent circuits (see paragraphs 6.4.2.2.24 and 6.4.2.2.25 of ISO 11992‑2:2003 and its Amd.1:2007).
     3.                           For the purpose of electronic response time measurement, the signal produced by the electronic simulator must be equivalent to a linear pneumatic pressure increase from 0.0 to 650 kPa in 0.2 ± 0.01 second.
     4.                           The brake response time must be taken from when the signal produced by the simulator exceeds the equivalent of 0.1 'E' (65 kPa), to when the pressure in the least favoured brake actuator reaches 75 per cent of its asymptotic value.
     5.                           Figure 5 shows an example of a suitable configuration and simulator for electronic response time measurement.
 2.                                 Applicability of results for other variants of a trailer 'Brake System'
     1.                           A variant of a 'Unique' trailer 'Brake System' will be considered to be identical in regard to response and release time, when the only variation from the 'Unique' 'Brake System' is one or more of the following:
             1.           Plumbing or energy transmission line lengths and number of fittings are reduced but other characteristics including diameter, material, type of connecting fittings and the characteristic transmission loss per unit length are not changed;
             2.           Entire subsections of the 'Brake System' have been removed, as would be the case in converting a modular three 'Axle' system to a modular two 'Axle' system, such that the effect if any is to slightly increase the energy