Document ID: chunk:federal_register_of_legislation:F2025C00113:front:0:p23
Version: federal_register_of_legislation:F2025C00113
Segment Type: other
Provision Reference: 
Character Range: 65188–68241

actuation energy level and the output torque for the 'Brakes' on each 'Axle' has been measured.
         2.                     To determine the 'Service Brake System' 'Skid Limit' a Service Brake Effectiveness Test must be conducted applying the brakes on all 'Axles' of the trailer and using the General Test Conditions of clause 10 and generally in accordance with the particular conditions of clause 11 with not less than 50 per cent of the 'Suspension Systems' rated 'Axle Group' load used in place of 'Gross Trailer Mass'.  Clause 11.2 need not be complied with.
         3.                     The test result must be reported as the value of the computed retardation force for each 'Axle' divided by the greatest of the 'Axle' retardation forces at which an 'Established Retardation Coefficient' of 0.45 can be achieved without wheel lock.
             1.               In the case of 'S-Cam' air 'Brake Systems' the overall effect of changing actuator and slack adjuster sizes can be simulated by individually adjusting the air pressure to each 'Axle'.
     2.                           'Suspension Systems' for hinged drawbar 'Pig Trailers'.
         1.                     The suspension must be installed according to the manufacturer's instructions to a representative trailer, be fitted with 'Axles', wheels and tyres of a size appropriate to the mass rating of the suspension, and be fitted with identical "Pre-calibrated" 'Brakes' at each 'Axle'.
             1.               "Pre-calibrated" in this case means that the relationship between the input actuation energy level and the output torque for the 'Brakes' on each 'Axle' has been measured.
         2.                     The trailer must be laden such that the 'Axle Group' load equals the suspension system's rated 'Axle Group' load and that the centre of gravity of the trailer is at the same height as for a typical trailer laden to the rated 'Axle Group'.
         3.                     To determine the 'Service Brake System' 'Skid Limit' a Service Brake Effectiveness Test Conditions test must be conducted applying the brakes on all 'Axles' on both the trailer and the towing vehicle such that the computed retardation of the trailer is within 0.05 m/s2 of that of the towing vehicle.
         4.                     The computed retardation must be derived from tests of each vehicle braked alone comparing the 'Control Signal' at the truck to trailer coupling with the retardation achieved.
         5.                     The test must be conducted using the General Test Conditions of clause 10 and generally in accordance with the particular conditions of clause 11.  Clause 11.2 need not be complied with.
         6.                     The test result must be reported as the value of the indicated retardation force for each 'Axle' divided by the greatest of the 'Axle' retardation forces at which an 'Established Retardation Coefficient' of 0.45, calculated with 'Total Combination Mass' held equal to 'Gross Trailer Mass', can be achieved without wheel lock.