Document ID: chunk:federal_register_of_legislation:F2025C00113:front:0:p15
Version: federal_register_of_legislation:F2025C00113
Segment Type: other
Provision Reference: 
Character Range: 42548–45607

if the sum of the force applied to the trailer towing point and the force due to the effect of gravity on the laden trailer mass, in the direction parallel to the test surface and trailer longitudinal axis, is greater than 0.18 times the 'Aggregate Trailer Mass'.
         2.                          Where the test involves a force depending on the slope of the test surface, the slope must not be less than 10 per cent.
         3.                          When the test involves the action of slope on the trailer or combination mass, and the towing vehicle remains connected, 1.5 per cent of the towing vehicle mass must be subtracted from the other forces parallel to the test plane, to allow for rolling friction.
         4.                          The test slope must be specified in terms of unit vertical per unit horizontal distance expressed as a percentage.
     2.                                 The 'Parking Brake System 38/...' must meet the requirements of clause 14.1 when the 'Foundation Brakes' geometry is such that a reversal of the required braking torque will not reduce the ability of the 'Parking Brake System 38/...' to generate the required braking torque.

 2.                                       RESPONSE AND RELEASE TIME MEASUREMENT
     1.                                 Except where hydraulic brakes are used, each 'Unique' trailer 'Brake System' must be shown to meet the requirements of clause 7.1.4 and 7.1.5 by testing in accordance with this clause 16, or in accordance with clause 21.
     2.                                 Where a trailer is fitted with a 'Variable Proportioning Brake System', the response/release time (as applicable) must be measured with the 'Variable Proportioning Brake System' set for the fully laden case.
     3.                                 In the case of trailers equipped with a pneumatic and an electric 'Control Line', the brake response time must be determined independently for each 'Control Line', according to the relevant procedures defined below.
     4.                                 Pneumatic response and release time measurement
         1.                           The pneumatic test rig described in Figure 3 must be calibrated by adjustment of the orifice (O) such that:
             1.           Upon application of the brake control valve (V) with the storage reservoir (R1) charged to 1.0 'E' (650 kPa), the time interval is between 0.18 and 0.22 seconds from when the initial pressure measured between the storage reservoir (R1) and the control valve (V) drops, or the initial pressure measured at the output of brake control valve (V) rises, to when the pressure at the end of the calibrating vessel (R2) increases to 0.65 'E' (420 kPa); and
             2.           After the pressure in the calibrating vessel (R2) has stabilised, 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