Document ID: chunk:federal_register_of_legislation:F2025C00107:front:0:p8
Version: federal_register_of_legislation:F2025C00107
Segment Type: other
Provision Reference: 
Character Range: 22722–25633

35/...' of 115 N in the case of 'Service Brake Systems' with a 'Brake Power Assist Unit'.

       Condition B

         B.1 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.

         B.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 must be so designed that the indicator lamp will only be activated when there are variations in the fluid level in that part of the reservoir provided exclusively for the use of the brake system.

 1.                               For a 'Service Brake System' incorporating one or more 'Brake Power Units 35/...' in any section of the 'Service Brake System', the 'Visible Indicator' must operate when the supply pressure in any one 'Brake Power Unit 35/...' drops to or below 65 per cent of the 'Average Operating Pressure'.
 2.                               For vehicles equipped to tow a trailer using air at positive pressure, when the pressure in the 'Supply Line 35/...' drops to or below 450 kPa, the 'Visible Indicator' must operate as required by clause 5.2.1.
     1.                         The 'Visible Indicator' may also operate when the 'Supply Line 35/...' energy level is reduced at a rate of not less than 0.15E/sec provided that in all cases the 'Visible Indicator' must operate as required by clause 5.2.1 when the pressure in the 'Supply Line 35/...' drops to or below 450 kPa.
     2.                         The 'Visible Indicator' must not operate when a trailer is not connected and no other defect is present.  The absence of a trailer may be determined by the pressure in the 'Supply Line 35/...' dropping to or below 35 kPa.
 3.                               Where the requirement of this clause 5.2 necessitates the provision of more than one system failure sensor, the sensors may be interconnected to actuate only one 'Visible Indicator'.
 4.                               As a check of function, the 'Visible Indicator' must be so designed that it operates when:
          1.                              the ignition or electrical control switch is turned from the 'engine off' position to the 'engine on' position, and the engine is not operating, and (unless a failure exists in the brake system) it must not operate when the engine is running; or
          2.                              the ignition or electrical control switch is in the 'engine start' position, and (unless a failure exists in the brake system) it must not operate after the return of the ignition or electrical control switch to the 'engine on' position; or
          3.                              the ignition or electrical control switch is in a position between the 'engine