Document ID: chunk:federal_register_of_legislation:F2014C01118:front:0:p16
Version: federal_register_of_legislation:F2014C01118
Segment Type: other
Provision Reference: 
Character Range: 46680–49866

as a percentage, on which the 'Parking Brake System 38/...' can hold the trailer must be determined by computing the total braking force at the wheels (N) to which the 'Parking Brake System 38/...' is fitted and dividing by [98.1 x 'Aggregate Trailer Mass' (tonnes)]
19.2.                                The braking force at each 'Axle' must be calculated according to

                 where:

            F is the tangential force at the braked wheels on the 'Axle' concerned

            A is the input to the park brake actuator in units of 'E'

            T is the 'Brakes' output torque per 1.0 'E' for the 'Park Brake System'

            R is the rolling radius of the tyre fitted to the wheel.

19.3.                                The provisions of clause 18.2.1, 18.2.2 & 18.2.3. must apply.
19.4.                                When 'Emergency Brake System' performance data is used to demonstrate compliance of the 'Parking Brake System 38/...', the geometry of the 'Brakes' must be such that brake effectiveness will be not less in the reverse direction.
20.                                      TIME RESPONSE
20.1.                                The time response of a 'Service Brake System' may be taken as complying with the requirements of this rule if the 'Service 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 20.2.
20.2.                                Actuator volumes at full  'Foundation Brake' stroke and line lengths may be reduced and actuator volumes at the point when the 'Foundation Brake' friction materials cease to contact each other may be increased (for release response test) from those specified in the 'Approved' 'Control System' documentation, but other devices, fittings and dimensions may not be changed.
21.                                      SPECIFICATION OF BRAKE SYSTEM COMPONENTS
21.1.                                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 the appropriate sub-paragraphs of clause 21.
21.2.                                'Control System'
21.2.1.                          The  'Control System' must be characterised by determining the 'Control System' ratio at not less than five points in the range of  'Control Signal' inputs at 0.2 'E' to 1.0 'E' . These points must be equally spaced except where the relationship within that range is non-linear, in which case the points must include each critical point
21.2.1.1.                    The  'Control System' ratio for each axle is Output Signal level as a percentage of 'Control Signal'  level.
21.2.1.2.                    The input must be taken at the trailer coupling.
21.2.1.3.                    The output must be taken at the outlet end of the line to the service brake actuator.
21.2.2.                          The input signal strength must be the final value of the applied signal and must be applied to the 'Control System' such that it rises from zero to 65 percent of