Document ID: chunk:federal_register_of_legislation:F2018C00341:body:0:p21
Version: federal_register_of_legislation:F2018C00341
Segment Type: other
Provision Reference: 
Character Range: 59948–62806

brake 'Control' is fully released, the pressure measured at the extremity of the 2.5 m long pipe with an internal diameter of 13 mm joined to the 'Coupling Head' of the 'Control Line 35/...' must fall below 35 kPa within 650 milliseconds of the 'Control' being released.
7.13.                                Service Brake Compatibility Test
7.13.1.                          Vehicles equipped to tow a trailer which uses air at positive pressure must be braked to a stop from initial speed of 60 km/h. For the first test a 'Control Signal' of 0.2 'E' (130 kPa) measured at the 'Coupling Head' must be used. Subsequent tests must be conducted increasing the 'Control Signal' in increments of not greater than 0.2 'E' (130 kPa) until an 'Established Retardation Co-efficient' of not less than 0.45 is reached. The vehicle must be laden to:
7.13.1.1.                    For vehicles not fitted with a 'Variable Proportioning Brake System' the manufacturer's 'GVM' and in a separate 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.  Where the vehicle is fitted with a 'Variable Proportioning Brake System', a further series of tests must be conducted with the vehicle laden to 'Lightly Loaded Test Mass 35/..'.
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