Document ID: chunk:federal_register_of_legislation:F2021C00433:body:0:p20
Version: federal_register_of_legislation:F2021C00433
Segment Type: other
Provision Reference: 
Character Range: 57461–60424

test to the Group 'Axle Load'  limits as specified in Table 2 if this results in a vehicle mass lower than the manufacturer's 'GVM'.

7.13.1.2.                    For vehicles fitted with a 'Variable Proportioning Brake System' the manufacturer's 'GVM' and in a separate test to the 'Lightly Loaded Test Mass 35/..'.

7.13.2.                          For the purposes of clause 4.1.10.2, where the vehicle has a  'Rated Towing Capacity' of more than 4.5 tonnes and the 'Manufacturer' elects not to provide certification which provides for the operation of trailer brakes using air at a positive pressure, the response of the 'Service Brake System' must be characterized as follows.  The vehicle must be laden to the Group 'Axle Load' limits as specified in Table 2 or the manufacturers  'GVM' whichever is the lesser, and a series of tests conducted braking the vehicle to a stop from initial speed of 60 km/h.  The output energy level of the 'Service Brake System', 'Control' and the 'ERC' achieved must be recorded for each test.  For the first test an 'ERC' in the range 0.05 to 0.1 must be achieved.  Subsequent tests must be conducted increasing the 'ERC' in not less than 5 evenly spaced steps until an 'ERC' of not less than 0.45 is reached.

7.13.3.                          The 'Service Brake System'  'ERC' must be determined according to the following as required:

         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 per cent of 'Average Operating Pressure'  and is measured in a separate test in accordance with clause 7.12.2 to 7.12.5.

7.14.                                         Alternative Procedures

7.14.1.                          Where a vehicle design has a number of configurations such that the 'GVMs' of these configurations span more than one vehicle category, testing at the higher of these 'GVMs' will be deemed to demonstrate compliance at the lower of these 'GVMs' provided that any differences in 'Lightly Loaded Test Mass' are fully tested and, for vehicles not equipped with a 'Variable Proportioning Brake System,', that the requirements of clause 7.13 are met at the lower 'GVMs'.

7.14.2.                          For vehicles not fitted with a 'Variable Proportioning Brake System', where clause 7.13.1.1 requires two tests at different masses, or where the provisions in clause 7.14.1 are utilised, the 'ERC' obtained by multiplying the 'ERC' determined from 7.13.3 at the tested mass, by the tested mass in tonnes, and then dividing that figure by the alternative mass in tonnes, will be deemed to be the 'ERC' for the alternative mass for the purposes of clause 4.1.9.

8.                                          ALTERNATIVE