Document ID: chunk:federal_register_of_legislation:F2021C00433:body:0:p8
Version: federal_register_of_legislation:F2021C00433
Segment Type: other
Provision Reference: 
Character Range: 22786–25899

from any 'Service Brake System' failure 'Visible Indicator' lamp.

4.4.3.                              In the case of a common lamp, the lamp must be labelled with the word "BRAKE"; or the symbol for "BRAKE FAILURE" - specified as Number 4.31 in the ISO document referred to in clause 4.2.10.

4.4.4.                              In the case of a distinct and separate lamp the lamp must be labelled with at least the words "PARK BRAKE" or "PARKING BRAKE"; or the symbol for "PARKING BRAKE" specified as Number 4.32 in the ISO document referred to in clause 4.2.10 placed either directly on the lens or adjacent to it in such a way that the label is illuminated by the same light source as the lens.

4.4.5.                              The letters of the label must be not less than 3 mm high and must be of contrasting colour to their background when illuminated.  If the label is directly on the lens the colour of either label or lens must be red and if the label is not on the lens the colour of the lens must be red.

4.4.6.                              The parking brake indicator lamp and its specified label must be located within the space boundaries specified in clause 4.2.12.

4.5.                                    Secondary Brake Systems

4.5.1.                              The vehicle must be equipped with a 'Secondary Brake System'.

4.5.2.                              Hydraulic 'Service Brake System' must be 'Split Service Brake System'.

4.5.3.                              If the vehicle is equipped with one or more 'Brake Power Units 35/...' the 'Secondary Brake System' must be capable of application through the medium of a 'Control'.

4.5.4.                              The 'Control' of the 'Secondary Brake System' must be capable of releasing and applying the secondary brake after its first application.  The 'Control' must be so placed that it can be operated by the driver in the normal driving position.

4.5.5.                              A 'Secondary Brake System' may utilise elements of the 'Service Brake System'.

4.5.6.                              Where the 'Secondary Brake System' is a 'Spring Brake System':

4.5.6.1.                        in a single circuit 'Service Brake System', the energy supply system for maintaining the secondary brake in its released position must include a 'Stored Energy' device that does not service any other device or equipment;

4.5.6.2.                                      in the event of failure of the energy supply to any one circuit of a 'Service Brake System' employing two or more independent circuits, the energy requirements for retaining the secondary brakes in the released position must be supplied from the 'Stored Energy' device(s) of the other circuits or optionally from an independent 'Stored Energy' device; and

4.5.6.3.                                      with the 'Stored Energy' device charged to its 'Average Operating Pressure' it must have sufficient capacity to permit the 'Secondary Brake System' to be applied and released not fewer than:

4.5.6.3.1.      -Two (2) times when the brakes