Document ID: chunk:federal_register_of_legislation:F2021C00433:body:0:p12
Version: federal_register_of_legislation:F2021C00433
Segment Type: other
Provision Reference: 
Character Range: 34439–37514

either the inlet to, or in the body of, the brake chamber with the slowest reaction time in each 'Axle Group' (in respect of brake timing as specified in clause 7.12).

4.7.5.3.                        a pressure test connection complying with clause 4 of ISO Standard 3583-1984 Road vehicles – Pressure test connection for compressed – air pneumatic braking equipment, must be fitted in the body of the  'Stored Energy' device used for the  'Service Brake System' which is charged last.

4.7.6.                              For  'Service Brake Systems' incorporating 'Brake Power Assist Units' and where the Secondary Brake  is not applied by the service brake 'Control' , the combined volume of all 'Stored Energy' devices must be such that with no replenishment of 'Stored Energy' the performance prescribed for the Laden Secondary Brake Test in clause 7.7 must be achieved:

4.7.6.1.                        where the energy source is a pump, on the eighth actuation of the service brake 'Control', after 7 actuations with vehicle stationary, either to full stroke or to the application of a 'Pedal Effort 35/...' not less than 685 N whichever occurs first; or

4.7.6.2.                        where the energy source is the engine of the vehicle, on the fourth actuation of the service brake 'Control', after 3 actuations with vehicle stationary, either to full stroke or to the application of a 'Pedal Effort 35/...' not less than 685 N, which ever occurs first..

4.7.7.                              An energy generating device producing energy at negative pressure must be capable of achieving the volume-pressure relationship required to satisfy the conditions specified in clause 4.7.6 in a time not exceeding 3 minutes with:

4.7.7.1.                        the engine operating at not greater than 65 percent of speed corresponding to either maximum power output or governed speed where the energy generating device is a vacuum pump; or

4.7.7.2.                        the engine operating at idle speed with the gear selector in "neutral" position where the engine itself is the energy generating device.

4.7.8.                              Where the device generating the energy for any number of 'Brake Power Unit 35/...' supplies energy to other devices, the design shall be such that all the 'Brake Power Unit 35/...' are preferentially charged to an energy level of not less than 0.69 'E' (450 kPa).

4.7.9.                              In the case of  'Service Brake Systems' incorporating 'Brake Power Unit 35/...' the design must be such that all 'Brake Power Unit 35/...' must preferentially service the brake system if the energy level falls below 0.69  'E' (450 kPa).

5.                                          PERFORMANCE REQUIREMENTS

5.1.                                    The vehicle must be capable of meeting the range of performance tests set out in the Table 1, subject to the general test conditions of part 6 and the particular test conditions of part 7.

5.2.                                    The sequence of testing may be