Document ID: chunk:federal_register_of_legislation:F2018C00339:body:0:p6
Version: federal_register_of_legislation:F2018C00339
Segment Type: other
Provision Reference: 
Character Range: 17466–20722

as in part 18, the 'Gross Trailer Mass' is to be multiplied by the ratio of the 'Prescribed Transition Mass' for each 'Configuration' divided by the 'Group Gross Axle Load Rating'.
6.                                          SERVICE  BRAKE  SYSTEM
6.1.                                    The 'Service Brake System' must be designed so that the braking force can be progressively increased and decreased by means of the 'Control Signal' from the towing vehicle.
6.2.                                    The combined total energy capacity of energy storage devices incorporated into the 'Service Brake System' must be not less than 8 times the combined maximum energy capacity of the service brakes actuating devices. In the case of compressed air 'Braking Systems', the ratio of air reservoir volume to actuator volume will be taken as being the ratio of energy capacity.
6.3.                                    The elapsed time, as measured in accordance with the procedure specified in part 15 for measuring brake actuation time response must not exceed in the case of:
         6.3.1.                               any brake actuator of any 'Axle Group' on the trailer, 0.4 seconds; and
         6.3.2.                               any trailer or dolly rear service coupling for towed trailers, 0.4 seconds.
6.4.                                    In the case of trailers, other than 'Pig Trailers' that are not 'Converter Dollies', designed for use in 'Road Trains' having a 'Gross Combination Mass' not exceeding 125 tonnes, the elapsed time as measured in accordance with the procedure specified in part 15 for measuring brake release time must not exceed, in the case of:
         6.4.1.                              any, trailer or dolly, rear service coupling for towed trailers, 0.65 seconds.
6.5.                                    Each 'Unique' trailer 'Service Brake System' must be either tested in accordance with parts 9 and 10 or be shown by calculation, based on data for approved components, as detailed in part 16 to have 'Established Retardation Coefficients' between the upper and lower boundaries of:
         6.5.1.                              Figure 1, when fully laden; and
         6.5.2.                              For trailers not equipped with an 'Antilock System', but fitted with a 'Variable Proportioning Brake System', Figure 2 when at 'UTM'; and
         6.5.3.                              For trailers not equipped with an 'Antilock System', but fitted with a 'Variable Proportioning Brake System', progressively between Figure 2 and Figure 1. 'Established Retardation Coefficients' may be determined by calculation for intermediate states of load between 'UTM' and fully laden. The calculations must include not less than 5 points and include any critical point.
6.5.4.                              The requirements relating to the figures specified in clauses 6.5.1, 6.5.2 and 6.5.3 are valid for trailers with only a pneumatic 'Control Line', as well as for trailers with an additional electric 'Control Line'. In both cases, the reference value (abscissa of the figures) will be the value of the transmitted pressure in the 'Control Line':
(a) For trailers equipped with a pneumatic 'Control Line' only, this will