Document ID: chunk:federal_register_of_legislation:F2021C00482:body:0:p6
Version: federal_register_of_legislation:F2021C00482
Segment Type: other
Provision Reference: 
Character Range: 16744–19592

once having become operative to signal a brake failure it shall operate whenever the ignition or electrical control switch is in the "engine on" position and the fault remains uncorrected.
35.2.1.2.5.              The 'Visible Indicator' may take the form of an indicator lamp or of a mechanical signalling device. At the option of the 'Manufacturer' where an indicator lamp is used the lamp shall be labelled with at least the word "BRAKE" or, the symbol for "BRAKE FAILURE" specified as No. 4.31 in International Standard ISO 2575-1982(E) - "Road Vehicles Symbols
for controls indicators and tell-tales" [#] , 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. The letters of the label shall be not less than 3 mm high and shall be of a contrasting colour to their background when illuminated. If the label is directly on the lens the colour of either label or lens shall be red and if the label is not on the lens the colour of the lens shall be red. An illuminated lamp may be either steady-burning or flashing. Where a mechanical signalling device is used, it shall display at least the word "BRAKE" in letters not less than 10 mm high when the signal is deployed. Letters and background shall be of contrasting colours, one of which is red.
35.2.1.2.6.              The service brake failure 'Visible Indicator' and its specified label or display shall be totally located forward of a transverse vertical plane through the point representing the intersection of the steering wheel axis of rotation and the plane of the steering wheel, and totally within the space bounded by:
35.2.1.2.6.1.       the right-hand internal side wall;
35.2.1.2.6.2.       a vertical plane along the longitudinal centreline of the vehicle;
35.2.1.2.6.3.       a horizontal plane through a point on the lower edge of the instrument panel; and
35.2.1.2.6.4.       a horizontal plane 150 mm above the highest point on the windscreen glass.
35.2.1.3.                    Where the service brake system incorporates a single 'Brake Power Unit 35/00' an 'Audible Indicator' shall be provided. Such device shall operate at all times when the service brake failure 'Visible Indicator' operates as specified in clause 35.2.1.2.1.3.
35.2.1.4.                    Where separate methods of actuation are provided for any of the functions of the brake system, the actuation of one function shall not cause the operation of another function.
35.2.1.5.                    Each service brake system shall incorporate devices which compensate for any increased movement of its components arising from wear. Such devices shall themselves contain provision for securing them throughout their working range in any position in which they may be adjusted to or to which they may themselves automatically