Document ID: chunk:federal_register_of_legislation:F2006L03060:body:0:p18
Version: federal_register_of_legislation:F2006L03060
Segment Type: other
Provision Reference: 
Character Range: 48912–52088

wheel skid and unrealised braking potential.

38.4.4.                          Parking Brake Calculation

38.4.4.1.                    The performance of the 'Parking Brake System 38/00' shall be determined on the basis of the characteristics of the 'Foundation Brakes' (where applicable) provided under clause 38.4.6.2 ('Foundation Brakes') and the control force available at the 'Brakes' actuator.

38.4.4.2.                    The provisions of clause 38.4.3.1.1 (spring brake force) shall apply.

38.4.4.3.                    When 'Emergency Brake System' performance data are used to demonstrate compliance of the 'Parking Brake System 38/00', the geometry of the 'Brakes' shall be such that brake effectiveness will be not less in the reverse direction.

38.4.5.                          Time Response

38.4.5.1.                    The time response of a 'Brake System' may be taken as complying with the requirements of this Rule if the 'Brake System' is installed in a manner identical to that prescribed in the documentation describing the 'Approved' 'Control System' used, except as allowed in clause 38.4.5.2 .

38.4.5.2.                    Actuator sizes and line lengths may be reduced to less than those specified in the 'Approved' 'Control System' documentation, but devices, fittings and other dimensions may not be changed without voiding approval of the 'Control System' in regard to time response.

38.4.6.                          Specification of 'Brake System' Components

Sub-assemblies of 'Brake System' components may be 'Approved' by the 'Administrator' as part of the 'Brake System' approval process where information has been supplied in accordance with the requirements of this clause.

38.4.6.1.                    'Control System'

38.4.6.1.1.              The 'Control System' shall be characterised by comparing output and input signal strengths at not less than five points equally spaced over the range 0.2 'E' to 1.0 'E'.

38.4.6.1.2.              The input signal strength shall be the final value of the signal and shall be applied to the 'Control System' such that it rises from zero to 65 per cent of the final value in not more than 0.22 second.

In the case of air 'Brake Systems' the input 'Control Signal' strength (kPa) will be measured at the trailer 'Control Line' coupling.

38.4.6.1.3.              The output signal strength shall be the final value of the signal generated for control of the 'Brakes' actuator and which shall be reached in not more than two seconds. The output signal strength (kPa) will be measured in the actuator attached to each output having a fundamentally different relation to the input.

In the case of air 'Brake System's' a 'Control Signal' path having additional pressure limiters, relay valves or other active devices will be considered as being fundamentally different.

38.4.6.1.4.              Time response shall be measured where necessary in accordance with clause 38.3.11 (time response measurement). Where the 'Control System' is not installed on an actual trailer, it shall be installed in an essentially identical manner, in the laboratory, with all bends, fittings and