Document ID: chunk:federal_register_of_legislation:F2021C01192:body:0:p36
Version: federal_register_of_legislation:F2021C01192
Segment Type: other
Provision Reference: 
Character Range: 96805–99722

be either recharged to that level or charged to above that level and discharged into a fixed load at approximately constant power until the required state of charge is reached. Alternatively, for vehicles with battery powered electric traction only, the state of charge may be adjusted by running the vehicle. Tests conducted with a battery partially charged at their start shall be commenced as soon as possible after the desired state of charge has been reached.
Annex 4
  Provisions relating to energy sources and energy storage devices (energy accumulators)
  Hydraulic braking systems with stored energy
1.   Capacity of energy storage devices (energy accumulators)
1.1.  General
1.1.1.  Vehicles on which the braking equipment requires the use of stored energy provided by hydraulic fluid under pressure shall be equipped with energy storage devices (energy accumulators) of a capacity meeting the requirements of paragraphs 1.2. or 1.3. of this annex;
1.1.2.  However, the energy storage devices shall not be required to be of a prescribed capacity if the braking system is such that in the absence of any energy reserve it is possible with the service brake control to achieve a braking performance at least equal to that prescribed for the secondary braking system;
1.1.3.  In verifying compliance with the requirements of paragraphs 1.2., 1.3. and 2.1. of this annex, the brakes shall be adjusted as closely as possible and, for paragraph 1.2. of this annex, the rate of full-stroke actuations shall be such as to provide an interval of at least 60 seconds between each actuation.
1.2.  Vehicles equipped with a hydraulic braking system with stored energy shall meet the following requirements:
1.2.1.  After eight full-stroke actuations of the service brake control, it shall still be possible to achieve, on the ninth application, the performance prescribed for the secondary braking system.
1.2.2.  Testing shall be performed in conformity with the following requirements:
1.2.2.1. Testing shall commence at a pressure that may be specified by the manufacturer but is not higher than the cut-in pressure;[12]
1.2.2.2. The energy storage device(s) shall not be fed; in addition, any energy storage device(s) for auxiliary equipment shall be isolated.
1.3.  Vehicles equipped with a hydraulic braking system with stored energy which cannot meet the requirements of paragraph 5.2.4.1. of this Regulation shall be deemed to satisfy that paragraph if the following requirements are met:
1.3.1.  After any single transmission failure it shall still be possible after eight full-stroke actuations of the service brake control, to achieve, at the ninth application, at least the performance prescribed for the secondary braking system.
1.3.2.  Testing shall be performed in conformity with the following requirements:
1.3.2.1. With the energy source stationary or operating at a speed corresponding to the engine