Document ID: chunk:federal_register_of_legislation:F2007C00493:front:0:p17
Version: federal_register_of_legislation:F2007C00493
Segment Type: other
Provision Reference: 
Character Range: 47774–50821

The pressure 0.65 seconds after release must be 0.05 'E' (35.0 kPa) or less.
22.2.8.                          All relevant test conditions pertaining to part 10 must be complied with.
22.2.9.                          The relationship between brake actuator volume and stroke must be measured and plotted from zero to full actuator stroke.
22.2.9.1.                    Where more than one actuator type is used, a plot for each actuator must be supplied. If several plots are shown on one graph, each plot must be identified and clearly related to the actuator details.
22.2.9.2.                    If the relationship between stroke and volume is not linear, all critical points must be measured and plotted.
22.2.9.3.                    The value of the maximum brake actuator design stroke and volume must be stated.
22.3.                                'Foundation Brakes'
22.3.1.                          The effectiveness of the 'Foundation Brakes' must be characterised by comparing the energy level of the signal provided to the 'Brakes' actuator against the output brake torque of the 'Brakes' device at not less than five points in the range 0.2 'E' to 1.0 'E'. These points must be equally spaced.  Where a test was not conducted at 1.0 'E' , the torque from a test conducted at 0.8 'E' or greater may be increased pro-rata to derive output torque at 1.0 'E' .
22.3.2.                          Parameters relevant to the specification of the 'Brakes' actuator including its stroke at each energy level of the signal provided to the 'Brakes' actuator must be recorded. In the case of 'S-Cam' air systems this will include the actuator size, slack adjuster length and any other special feature.
22.3.3.                          Measurements must be taken in accordance with the relevant conditions for the road test described in parts 10 and 11.
22.3.4.                          The 'Brakes' must be burnished before conducting any effectiveness tests according to the brake manufacturer's recommended procedures.
22.3.5.                          Specification of effectiveness for 'Foundation Brakes' must be on the basis of 'Axle' performance with two brake assemblies rather than wheel performance.
22.3.6.                          The 'Foundation Brake' must, on the next application after not less than 20 successive applications, each not more than 70 seconds after the preceding one and with the total of 20 applications completed within 20 minutes, of the trailer 'Brakes' from an initial speed of 60 km/h to a final speed as calculated by clause 22.3.6.1, achieve a calculated brake torque, when tested in accordance with part 11, at a nominated energy level of the signal provided to the 'Brakes' actuator, of not less than 60 percent of the brake torque achieved at that Actuator Supply Energy level when tested in accordance with clause 22.3.1. The chosen, nominated energy level of the signal provided to the 'Brakes' actuator, must not be less than that necessary to produce a calculated 'Established Retardation Coefficient'