Document ID: chunk:federal_register_of_legislation:F2007C00493:front:0:p12
Version: federal_register_of_legislation:F2007C00493
Segment Type: other
Provision Reference: 
Character Range: 33654–36639

fittings are reduced but other characteristics including diameter, material, type of connecting fittings and the characteristic transmission loss per unit length are not changed.
16.2.2.                          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 flow rate to and from the remaining brake sub-systems.
16.2.3.                          The energy required to actuate the substitute brake actuators to their maximum design level is less.
16.3.                                Where a trailer 'Brake System' is required to be tested for compliance with clauses 7.3 and 7.4 in the case of compressed air 'Brake System', the test rig described in Figure 2 must be calibrated in accordance with clause 16.4 and connected as described in Figure 3.
16.4.                                The test rig described in Figure 2 must be calibrated by adjustment of the orifice (O) such that;
16.4.1.                          upon application of the brake control valve (V) with the storage reservoir (R1) charged to 1.0 'E' (650 kPa), the time between the initial pressure drop measured between the storage reservoir and the control valve (V), and the pressure at the end of the calibrating vessel (R2) increasing to 0.65 'E' (420 kPa), is between 0.18 and 0.22 seconds and,
16.4.2.                          the pressure in the calibrating vessel (R2) having stabilised, upon release of the brake control valve (V) must be such that the time between the initial pressure drop in the calibrating vessel (R2) and the pressure in the calibrating vessel (R2) reaching 0.05 'E' (35.0 kPa) is between 0.4 and 0.5 seconds.
16.5.                                Where one setting of the orifice (O) does not meet both of these conditions simultaneously, two different settings meeting the appropriate condition can be used in the tests prescribed in clauses 16.8 and 16.9 .
16.6.                                Where a rear service coupling for towed trailers is provided, time responses must be measured with an 800 millilitre vessel attached to the rear service coupling as in Figure 3.
16.7.                                The test rig and the trailer energy storage devices must be charged to 1.0 'E' (650 kPa) prior to the test being conducted and no additional energy must be added to the storage vessel (R1) or the trailer 'Supply Line' during the period of the test.
16.8.                                The brake actuation time must be taken from when the pressure level, measured between the storage reservoir and the control valve, initially drops to when the pressure in the least favoured brake actuator reaches 0.65 'E' (420 kPa).
16.9.                                With an initial service brake application level of 1.0 'E' (650 kPa) the brake release time must be taken from when the pressure level, measured