Document ID: chunk:federal_register_of_legislation:F2021C00476:body:0:p38
Version: federal_register_of_legislation:F2021C00476
Segment Type: other
Provision Reference: 
Character Range: 106049–109171

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 must 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; 1[/]

         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 idling speed, any transmission failure may be induced.  Before inducing such a failure, the energy storage device(s) shall be at a pressure that may be specified by the manufacturer but not exceeding the cut-in pressure;

         1.3.2.2. The auxiliary equipment and its energy storage devices, if any, shall be isolated.

         2.   CAPACITY OF HYDRAULIC FLUID ENERGY SOURCES

         2.1.  The energy sources shall meet the requirements set out in the following paragraphs.

         2.1.1.    Definitions

         2.1.1.1. "p1" represents the maximum system operational pressure (cut-out pressure) in the energy storage device(s) specified by the manufacturer.

         2.1.1.2. "p2" represents the pressure after four full-stroke actuations with the service brake control, starting at p1, without having fed the energy storage device(s).

         2.1.1.3. "t" represents the time required for the pressure to rise from p2 to p1 in the energy storage device(s) without application of the brake control.

         2.1.2.  Conditions of measurement

         2.1.2.1. During the tests to determine the time t, the feed rate of the