Document ID: chunk:federal_register_of_legislation:F2006L03061:body:0:p12
Version: federal_register_of_legislation:F2006L03061
Segment Type: other
Provision Reference: 
Character Range: 33562–36730

with the pressure being measured at the point most remote from that of air entry.

38.3.3.2.4.              Either stopping distance or time from the point where the trailer brake control commences actuation from the "off" position, to the point where the trailer comes to a stop, may be used to calculate the 'ERC' according to the equations in clause 38.3.3.2.5 A calibrated decelerometer and chart recorder may also be used.

38.3.3.2.5.              The 'Service Brake System' Established Retardation Coefficient shall be determined according to the following as required:

where:

V is the initial speed km/h

S is the 'Stopping Distance' metres

T is the 'Stopping Time' seconds

'Total Combination Mass' tonnes

'Total Trailer Axle Load' tonnes

K1 is the time delay constant referred to in clause 38.3.1.3 and should be set at 0.09 for air 'Brake Systems' unless it is shown that an alternative value should be used.

K3 is the effective time delay of 0.32 seconds referred to in clause 38.3.1.3 for air 'Brake Systems' and this value should be used unless a more appropriate value can be demonstrated.

38.3.3.2.6.              The computed 'Established Retardation Coefficients' determined from clause 38.3.3.2.5 shall comply with clause 38.2.2.6 (service effectiveness).

38.3.3.2.7.              No part of the 'Brake System' shall exceed 100°C immediately prior to the commencement of a brake test sequence.

38.3.3.3.                    No trailer wheels shall remain locked, except below approximately 10 km/h, during completion of the braking tests required by the sections of clause 38.3.3.2.

38.3.3.4.                    In the case of 'Dog Trailers' at least one front 'Axle' shall skid before at least one rear 'Axle' at an 'ERC' greater than:

         (a)  0.3 in the case of two 'Axle' 'Dog Trailers';

         (b)  0.15 in the case of 'Dog Trailers' with three or more 'Axles'.

38.3.3.4.1.              The test shall be conducted generally in accordance with clause 38.3.3.2 (service brake effectiveness) with the 'Control Signal' and surface type selected to demonstrate the requirement of clause 38.3.3.4 above.

The initial speed requirement of clause 38.3.3.2.1 does not apply.

38.3.3.5.                    Computer simulation of the requirements of clause 38.3.3 is allowed where the simulation is sufficiently sophisticated and has been approved by the 'Administrator' on the basis of an adequate back to back comparison with physical test results.

38.3.4.                          Service Brake Fade Effectiveness

38.3.4.1.                    Each 'Unique' trailer 'Service Brake System' shall be shown by either test in accordance with clause 38.3.2 (general test conditions) and clause 38.3.4.2 (service brake fade effectiveness test) or by the calculation based on data for 'Approved' components in clause 38.4.2 (service brake fade calculation), to meet the requirements of clause 38.3.4.2.1 (degree of fade) and clause 38.2.2.5 (distribution of fade resistance).

38.3.4.2.                    Service Brake Fade Effectiveness Test

38.3.4.2.1.              The 'Service Brake System' shall, on the next