Document ID: chunk:federal_register_of_legislation:F2006L03060:body:0:p19
Version: federal_register_of_legislation:F2006L03060
Segment Type: other
Provision Reference: 
Character Range: 51826–55046

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 worst case line lengths and representative actuator volumes installed. Actuator displacement shall be the largest volume for which the 'Control System' is designed and it may be represented by an equivalent fixed volume.

38.4.6.1.5.              All relevant test conditions pertaining to clause 38.3.2 (road test general conditions) shall be complied with.

38.4.6.1.6.              The 'Control System' to be approved shall be fully documented and the logic of its operation described and assurances provided that the 'Control System' will meet the systems requirements of this Rule.

38.4.6.2.                    'Foundation Brakes'

38.4.6.2.1.              The effectiveness of the 'Foundation Brakes' shall be characterised by comparing the 'Control Signal' provided to the 'Brakes' actuator against the output brake torque of the 'Brakes' device at not less than five points approximately equally spaced over the range 0.2 'E' to 1.0 'E'.

Parameters relevant to the specification of the 'Brakes' actuator, and its stroke at each 'Control Signal' level, shall be recorded. In the case of 'S-Cam' air systems this will include the actuator size, slack adjuster length and any other special feature.

38.4.6.2.2.              Measurements shall be taken under the conditions prescribed for the dynamometer test in clauses 38.3.8 and clause 38.3.9 or in accordance with the relevant conditions for the road test described in clause 38.3.2 and clause 38.3.3.

38.4.6.2.3.              The 'Brakes' shall be burnished before conducting any effectiveness tests according to the brake manufacturer's recommended procedures.

38.4.6.2.4.              Specification of effectiveness for 'Foundation Brakes' shall be on the basis of 'Axle' performance with two brake assemblies rather than wheel performance.

38.4.6.3.                    Suspension Behaviour

38.4.6.3.1.              Suspensions shall be classified by the 'Administrator' as 'Brake Reactive Suspensions' or non 'Brake Reactive Suspensions'.

38.4.6.3.2.              Suspensions being determined as brake reactive shall be further specified in accordance with the remainder of clause 38.4.6.3.

38.4.6.3.3.              The 'Skid Limit' for each 'Axle' as determined by the need to provide service, emergency and parking 'Brakes' shall be determined.  It is necessary to determine the 'Skid Limit' for each braked 'Axle' in a group of 'Axles' connected by a 'Brake Reactive Suspension' to ensure that brake induced 'Axle' Load changes do not lead to premature wheel lock-up. Note: Premature wheel skid could either be unsatisfactory in its own right (service brake effectiveness) or it could invalidate calculations based on no-skid performance (parking and emergency brake effectiveness).

38.4.6.3.4.              For a 'Service Brake System' 'Axle Group' the 'Skid Limit' value, or a range of values, at a total retardation not less than 0.45 the 'Axle Group' load shall be