Document ID: chunk:federal_register_of_legislation:F2025C00108:front:0:p6
Version: federal_register_of_legislation:F2025C00108
Segment Type: other
Provision Reference: 
Character Range: 17141–20348

and must be polarized.  Couplings must comply with the requirements of AS 4945‑2000 (Commercial road vehicles - Interchangeable quick connect/release couplings for use with air-pressure braking systems).
         2.                           Where the vehicle is equipped to tow a trailer which uses air at a positive pressure, the 'Established Retardation Coefficient' of the 'Service Brake System', measured using the general test conditions of clause 7 and the particular test conditions of clause 8.13, must be between the upper and lower boundaries of Figure 1 for each value of 'Control Signal' used, when fully laden.
             1.                     Where the vehicle is a variant of a previously tested vehicle and the effects of the changes on braking performance are known by a test conducted on a complete vehicle, a component or a sub-assembly of components, the requirements of this clause can be met by 'Approved' calculations.
             2.                     The requirements relating to the figure specified in this clause 5.1.14 are applicable for vehicles with a pneumatic 'Control Line' only, as well as for vehicles with an additional electric 'Control Line'.  In both cases, the reference value (horizontal coordinate of the figure) will be the value of the transmitted pressure in the 'Control Line':
                     1.             For a pneumatic 'Control Line', this will be the actual pneumatic pressure in the 'Control Line';
                     2.             In the case of an additional electric 'Control Line', this will be the pressure corresponding to the transmitted digital demand value in the electric 'Control Line', according to ISO 11992:2003, including ISO 11992‑2:2003 and its Amd.1:2007.
             3.                     Vehicles equipped with both pneumatic and electric 'Control Lines' must satisfy the requirements of the figure related to both 'Control Lines'.  However, identical braking characteristic curves are not required for each of these 'Control Lines'.
         3.                           Where the vehicle has a 'Rated Towing Capacity' of more than 4.5 tonnes, either:
                 1.             the vehicle must have certification which provides for the operation of trailer brakes using air at a positive pressure as described in clauses 5.1.12 and 5.1.14; or
                 2.             the 'Secretary' may request the 'Manufacturer' to provide sufficient data to allow the vehicle's 'Service Brake System' to be modelled under laden braking conditions.
         1.                     Provision of the data derived from the tests performed as described by clause 8.13.2 will be considered sufficient for the purposes of part (b) of this clause 5.1.15.
         2.                     Where the vehicle is a variant of a previously tested vehicle and the effects of the changes on braking performance are known by a test conducted on a complete vehicle, a component or a sub-assembly of components, the requirements of this clause can be met by 'Approved' calculations.
         1.                           Where the 'Service Brake System' incorporates a single 'Brake Power Unit 35/...', an 'Audible Indicator' must be