Document ID: chunk:federal_register_of_legislation:F2007C00493:reg:3:p1
Version: federal_register_of_legislation:F2007C00493
Segment Type: reg
Provision Reference: reg 3 (pt 1/3)
Character Range: 58259–61025

3
                   S S S                      15
                   D D D                      20.0
                   W1 W 1 W 1 or W 2 W 2 W 2  20.0

"a":

 S Single tyre per wheel

 D Dual tyres per wheel

 W 1  ' Wide Single Tyre' (375 to 450 mm width)

 W 2  ' Wide Single Tyre' (over 450 mm width)

USE OF TRAILER COMPRESSED AIR BRAKE TEST RIG

NOMENCLATURE FOR FIGURES 2 AND 3

       A = A Supply connection with single check valve and regulator set at 650 kpa
       CF  = trailer brake actuator
       L  = coupling hose, 13 mm nominal bore and 2.5 metres long
       M  = Pressure gauge
       O  = orifice (see clause 16.4)
       R1  = reservoir of not less than 30,000 ml
       R2  = calibrating vessel of 800 ± 5 ml
       RA  = shut off valve
       TA  = coupling head - supply (emergency)
       TC  = coupling head - control (service)
       TOA  = transducer point for timing inlet to brake actuation time
       TOR  = transducer point for timing inlet to brake release time
       T1  = transducer point for calibration at end of R2 reservoir
       T2 = transducer point for testing rear tow coupling of trailer
       T3  = transducer point for testing trailer
       V  = brake control valve

APPENDIX 1

Special Provisions for TC Category Trailers over 4.5 Tonnes ATM and TD Category Trailers Incorporating an 'Antilock System'

      1. PERFORMANCE REQUIREMENTS

      1.1 The 'Brake System' of trailers must comply with the requirements of this ADR including clause 7.5 with the 'Antilock Systems' operational and in the event of a failure of the 'Antilock System' .

      1.2 At speeds exceeding 15 km/h the wheels on the 'Axle(s)' specified in clause 2.1 of this APPENDIX must remain unlocked when a 'Control Signal' of 1.0 'E' (650 kPa) is suddenly applied from an initial speed of 40 km/h +5 to -1 km/h and from an initial speed of at least 80 km/h on a road surface having approximately uniform surface friction on both sides of the vehicle.

      1.2.1 This test is to be performed with the trailer laden to both 'Lightly Laden Test Mass' and 'Maximum Loaded Test Mass' and using the general test conditions from clause 10 and the particular test conditions from clause 11, amended as regards 'Control Signal' amplitude and application rates .

      1.2.2 Brief periods of locking of the wheels are allowed, but stability must not be affected.

      1.1.3 The operation of an 'Antilock System' must not be adversely affected by magnetic or electric fields.

      2. INSTALLATION REQUIREMENTS

      2.1 An 'Antilock System' complying with clause 1 of this APPENDIX must be fitted to:

      2.1.1 each 'Single Axle';

      2.1.2 at least one 'Axle' in any 'Tandem Axle Group';

      2.1.3 at least two 'Axles' in any