Document ID: chunk:federal_register_of_legislation:F2007C00493:front:0:p9
Version: federal_register_of_legislation:F2007C00493
Segment Type: other
Provision Reference: 
Character Range: 25152–28344

to the commencement of a brake test sequence.
11.                                      SERVICE BRAKE EFFECTIVENESS TEST CONDITIONS
11.1.                                The initial speed at the point where trailer braking commences must be:
11.1.1.                          for trailers having a 'Aggregate Trailer Mass' up to 45 tonnes and not being restricted by design speed limitations, 58 to 64 km/h.
11.1.2.                          for trailers having a 'Aggregate Trailer Mass' greater than 45 tonnes, or special trailers having a design speed less than 58 km/h, not less than the 'Manufacturer's' nominated design speed.
11.2.                                The trailer must be braked to a stop from initial speed starting with a 'Control Signal' of 0.2 'E' and in increasing increments of not greater than 0.2 'E' for subsequent stops until an 'Established Retardation Co-efficient' of not less than 0.45 is achieved.
11.3.                                In the case of a compressed air 'Brake System' the 'Control Signal', applied to the 'Control Line' at the front of the trailer, must reach 65 percent of the final value in less than 0.4 second.
11.4.                                'Stopping Distance' or 'Stopping Time' may be used to calculate the 'ERC' according to the equations in clause 11.5.
11.5.                                The 'Service Brake System' 'ERC' must be determined according to the following as required:
ERC =  0.00394V2     'Total Combination Mass'
       S-0.278TRV     'Gross Trailer Mass'

ERC =  0.0283V    'Total Combination Mass'
       T-TR        'Gross Trailer Mass'

         where:

         V is the initial speed in km/h
         S is the 'Stopping Distance' in metres
         T is the 'Stopping Time' in seconds

         TR is the response time measured from the time the 'Control' leaves the 'Initial Brake Control Location' until the energy level at the least favoured actuator reaches 65 percent of final value

         'Total Combination Mass' in tonnes

         'Gross Trailer Mass' in tonnes

11.6.                                The computed 'Established Retardation Coefficients' determined from clause 11.5 must comply with clause 7.5, where a test was not conducted at 1.0 'E' the 'ERC' from a test conducted at 0.8 'E' or greater may be increased pro-rata to derive 'ERC' at 1.0 'E' .
11.7.                                No trailer wheels must remain locked, except below 15 km/h, during completion of the braking tests required by part 11.
11.8.                                Allowance must be made for the effect of the increased rolling resistance resulting from the combination of vehicles being used to carry out the tests.
12.                                      DOG TRAILER FRICTION UTILISATION
         In the case of 'Dog Trailers' at least one front 'Axle' must 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' .

12.1.                                The test must be conducted generally in accordance with part 11 with the 'Control Signal' and surface