Document ID: chunk:federal_register_of_legislation:F2018C00341:body:0:p5
Version: federal_register_of_legislation:F2018C00341
Segment Type: other
Provision Reference: 
Character Range: 14480–17514

Where the vehicle has a 'Rated Towing Capacity' of more than 4.5 tonnes, either:
4.1.10.1.                                  the vehicle must have certification which provides for the operation of trailer brakes using air at a positive pressure as described in clause 4.1.9 or
4.1.10.2.                    the 'Manufacturer' must supply to the 'Administrator' sufficient data to allow the vehicle's 'Service Brake System' to be modelled under laden braking conditions.  Provision of the data derived from the tests performed as described by clause 7.13.2 will be considered as sufficient to meet the requirements of this clause.
4.1.10.3.                    Where the vehicle is a variant of a previously tested vehicle and the effects of the changes on braking performance are known by a test conducted on a complete vehicle, a component or a sub-assembly of components, the requirements of this clause can be met by 'Approved' calculations.
4.1.11.                                        Where the 'Service Brake System' incorporates a single 'Brake Power Unit 35/...' an 'Audible Indicator' must be provided which must operate at all times when the service brake failure 'Visible Indicator' operates as specified in clause 4.2.
4.1.12.                          Each air reservoir in a compressed air 'Brake System' must be fitted with a manual condensate drain valve at the lowest point. An automatic condensate valve may be fitted provided it also drains the lowest point.  The manual drain valve may be incorporated in the automatic valve.
4.2.                                    'Visible Indicator'
4.2.1.                              The 'Visible Indicator' must operate whenever any of the conditions listed in clauses 4.2.2 to 4.2.4 as applicable occur while the ignition or electrical control switch is in the "engine on" position or while the engine is running.
4.2.2.                              For a 'Service Brake System' incorporating a hydraulic brake circuit and no 'Brake Power Unit 35/...' in that hydraulic circuit, condition A or optionally condition B must be met;
       Condition A

         A.1 When a pressure failure occurs in any part of the 'Service Brake System', except for pressure failure caused by either:

         A.1.1 a structural failure of a housing that is common to two or more sub-systems; or

         A.1.2 failure of a component of a 'Brake Power Assist Unit'.

         A.2 In the event of such failure, the indicator operation requirement is deemed to be satisfied if the indicator operates before or upon application of:

         A.2.1 a differential line pressure of not more than 1.55 MPa between the active and failed brake systems measured either at a master cylinder outlet, or at a slave cylinder outlet if the master cylinder controls a slave cylinder at a booster unit;

         A.2.2 a 'Pedal Effort 35/...' of 225 N in the case of unassisted 'Service Brake Systems'; or

         A.2.3 a 'Pedal Effort 35/...' of 115 N in the case of  'Service Brake Systems' with a 'Brake