Document ID: chunk:federal_register_of_legislation:F2021C01192:body:0:p37
Version: federal_register_of_legislation:F2021C01192
Segment Type: other
Provision Reference: 
Character Range: 99450–102392

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 energy source shall be that obtained when the engine is running at the speed corresponding to its maximum power or at the speed allowed by the over-speed governor.
2.1.2.2. During the test to determine the time t, energy storage device(s) for auxiliary equipment shall not be isolated other than automatically.
2.1.3.  Interpretation of results
2.1.3.1. In the case of all vehicles, the time t shall not exceed 20 seconds.
3.  Characteristics of warning devices
  With the engine stationary and commencing at a pressure that may be specified by the manufacturer but does not exceed the cut-in pressure, the warning device shall not operate following two full-stroke actuations of the service brake control.
Annex 5
  Distribution of braking among the axles of vehicles
1.  General
  Vehicles which are not equipped with an anti-lock system as defined in Annex 6 to this Regulation shall meet all the requirements of this annex. If a special device is used, this shall operate automatically.
2.  Symbols
                     i = axle index (i = 1, front axle;
                       i = 2, rear axle)
                     Pi = normal reaction of road surface on axle i under static conditions
                     Ni = normal reaction of road surface on axle i under braking
                     Ti = force exerted by the brakes on axle i under normal braking conditions on the road
                     fi = Ti/Ni , adhesion utilized by axle i [13]
                     J = deceleration of the vehicle
                     g = acceleration due to gravity : g = 9.81 m/s2
                     z = braking rate of vehicle =