Document ID: chunk:federal_register_of_legislation:F2025C00113:reg:4:p2
Version: federal_register_of_legislation:F2025C00113
Segment Type: reg
Provision Reference: reg 4 (pt 2/10)
Character Range: 73891–76894

transducer point at end of R2 vessel for testing rear tow coupling of trailer
T3  = transducer point for testing trailer brake response
V  = brake control valve

FIGURE 5 – EXAMPLE ELECTRIC 'CONTROL LINE' TEST RIG

NOMENCLATURE FOR FIGURE 5
ECL =  Electric Control Line corresponding to ISO 7638
SIMU =  Simulator of Byte 3,4 of EBS 11 according to ISO 11992‑2:2003 including its Amd-1
   2007 with output signals at start, 65 kPa and 650 kPa
A =  Supply connection with shut-off valve
C2 =  Pressure switch to be connected to the brake actuator of the trailer, to operate at
   75 per cent of the asymptotic pressure in the brake actuator CE
CE =  Brake cylinder
M =  Pressure gauge
PP =  Pressure test connection
TA =  Coupling head, supply line
VRU =  Emergency relay valve

APPENDIX 1

     Additional requirements for trailers (over 4.5 tonnes 'ATM') fitted with a 'Variable Proportioning Brake System'

 1.                                  Requirements
     1.                            Trailers fitted with a 'Variable Proportioning Brake System' must have markings affixed in a visible position on the trailer in indelible form and containing the following information:
         1.                     Where the 'Variable Proportioning Brake System' consists of a device mechanically controlled by the suspension of the trailer, the useful travel (recommended units of mm) of the device between the positions corresponding to 'UTM' and 'GTM', as well as any further information to enable the setting of the device to be checked in service.
             1.               Where the 'Variable Proportioning Brake System' consists of a device controlled via the suspension of the trailer by any other means, the information necessary to enable the setting of the device to be checked in service.
         2.                     Where the 'Variable Proportioning Brake System' consists of a device which modulates the air pressure in the brake transmission, the 'Axle' load(s) (recommended units of kg) corresponding to the 'UTM' and 'GTM' for the 'Axle(s)' which control(s) the device and the corresponding nominal inlet and outlet pressures (recommended units of kPa) of the device, as well as any further information to enable the setting of the device to be checked in service.  The inlet pressure must be not less than 80 per cent of the maximum design inlet pressure, as declared by the trailer manufacturer.
     2.                            Trailers fitted with an electronically controlled 'Variable Proportioning Brake System' (including as part of a 'Vehicle Stability Function'), that cannot fulfil the requirements of clause 1.1 of this appendix above, must have a self‑checking procedure of the functions which influence brake force distribution.
     3.                            Each 'Unique' trailer 'Service Brake System' must be shown by either testing in accordance with clauses 10 and 11 (excluding clause 11.2) of this standard, or by calculation based on data for 'Approved'