Document ID: chunk:federal_register_of_legislation:F2021C00477:body:0:p15
Version: federal_register_of_legislation:F2021C00477
Segment Type: other
Provision Reference: 
Character Range: 40111–42833

tell-tale signal lighting up when the fluid in the reservoir is below a certain level specified by the manufacturer is permitted. The tell-tale signal must be visible even by daylight; the satisfactory condition of the signal must be easily verifiable by the driver from the driver's seat. The failure of a component of the device must not entail total loss of the braking equipment's effectiveness. Application of the parking brake must also be indicated to the driver. The same tell-tale signal may be used.
5.2.4. Where use is made of energy other than the muscular energy of the driver, there need not be more than one source of such energy (hydraulic pump, air compressor, etc.), but the means by which the device constituting that source is driven must be as safe as practicable.
5.2.4.1. In the event of failure in any part of the transmission of a braking system, the feed to the part not affected by the failure must continue to be ensured if required for the purpose of halting the vehicle with the degree of effectiveness prescribed for secondary braking. This condition must be met by means of devices which can easily be actuated when the vehicle is stationary, or by automatic means.
5.2.4.2. Furthermore, storage devices located down-circuit of this device must be such that in the case of a failure in the energy supply after four full-stroke actuations of the service brake control, under the conditions prescribed in paragraph 1.2. of Annex 4 to this Regulation, it is still possible to halt the vehicle at the fifth application, with the degree of effectiveness prescribed for secondary braking.
5.2.4.3. However, for hydraulic braking systems with stored energy, these provisions can be considered to be met provided that the requirements of paragraph 1.3. of Annex 4 to this Regulation, are satisfied.
5.2.5. The requirements of paragraphs 5.2.2., 5.2.3. and 5.2.4. above must be met without the use of any automatic device of a kind such that its ineffectiveness might pass unnoticed through the fact that parts normally in a position of rest come into action only in the event of failure in the braking system.
5.2.6. The service braking system shall act on all wheels of the vehicle and shall distribute its action appropriately among the axles.
5.2.7. In the case of vehicles equipped with electric regenerative braking systems of category B, the braking input from other sources of braking, may be suitably phased to allow the electric regenerative braking system alone to be applied, provided that both the following conditions are met:
5.2.7.1. Intrinsic variations in the torque output of the electrical regenerative braking system  (e.g. as a result of changes in the electric state of charge