Document ID: chunk:federal_register_of_legislation:F2021C00482:body:0:p4
Version: federal_register_of_legislation:F2021C00482
Segment Type: other
Provision Reference: 
Character Range: 11321–14403

shall have one or more service brake failure 'Visible Indicators'.
35.2.1.2.1.              The 'Visible Indicator' shall operate whenever any of the following conditions occur whilst the ignition or electrical control switch is in the "engine on" position and also whenever any of the following conditions occur whilst the engine is running:

         35.2.1.2.1.0.1 for a service brake system incorporating an hydraulic brake circuit and no 'Brake Power Unit 35/00' in that hydraulic circuit, condition 35.2.1.2.1.1 or optionally condition 35.2.1.2.1.2;

         35.2.1.2.1.0.2  for a service brake system incorporating one or more 'Brake Power Units 35/00' in any section of the service brake system, condition 35.2.1.2.1.3.

         35.2.1.2.1.0.3  Where the requirements of this clause (35.2.1.2) necessitate the provision of more than one system failure sensor, the sensors may be interconnected to actuate only one 'Visible Indicator';

35.2.1.2.1.1.       When a pressure failure occurs in any part of the service brake system, except for pressure failure caused by either:

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

           35.2.1.2.1.1.0.2  failure of a component of a 'Brake
           Power Assist Unit'

           35.2.1.2.1.1.0.3  In the event of such failure, for the purpose of this clause (35.2.1.2.1) the indicator operation requirement shall be deemed to be satisfied if the indicator operates before or upon application of:

            35.2.1.2.1.1.0.3.1 a differential line pressure of not more than 1.55 MPa between the active and failed brake systems;

            35.2.1.2.1.1.0.3.2 a 'Pedal Effort 35/00' of 225 N in the case of unassisted service brake systems; or

            35.2.1.2.1.1.0.3.3 a 'Pedal Effort 35/00' of 115 N in the
            case of service brake systems with a 'Brake Power Assist
            Unit'.

            35.2.1.2.1.1.0.3.4 For the purposes of this clause (35.2.1.2.1.1.0.3), differential line pressure shall be 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.

35.2.1.2.1.2.       When a drop in the level of brake fluid occurs in the reservoir(s), either to less than the 'Manufacturer's' designated minimum level or to less than 25 per cent of the reservoir(s) fluid capacity whichever is the greater volume remaining.
35.2.1.2.1.3.       When the supply pressure in any one 'Brake Power Unit 35/00' drops to or below 65 per cent of the 'Average Operating Pressure'.
35.2.1.2.2.              In the case where a master cylinder reservoir also contains fluid for the use of a system other than the brake system, the indicator system and the reservoir shall be so designed that the indicator lamp will not be activated when there are any variations in the fluid level in that part of the reservoir provided exclusively for the use of the system other than the brake system.
35.2.1.2.3.              As a check of function the 'Visible Indicator' shall be