Document ID: chunk:federal_register_of_legislation:F2006L03060:body:0:p20
Version: federal_register_of_legislation:F2006L03060
Segment Type: other
Provision Reference: 
Character Range: 54785–57737

based on no-skid performance (parking and emergency brake effectiveness).

38.4.6.3.4.              For a 'Service Brake System' 'Axle Group' the 'Skid Limit' value, or a range of values, at a total retardation not less than 0.45 the 'Axle Group' load shall be determined.

The test result shall be reported as the value of the indicated retardation force for each 'Axle' divided by the greatest of the 'Axle' retardation forces.

In the case of 'S-Cam air 'Brake Systems' the overall
effect of changing actuator and slack adjuster sizes can be
simulated by individually adjusting the air pressure to
each 'Axle'.

38.4.6.3.5.              For an 'Emergency Brake System' or a 'Parking Brake System 38/00' the 'Skid Limit' value shall be specified as the dimensionless ratio:

Indicated retardation force
Static 'Axle Load'

The limit value should be determined by increasing the braking uniformly on all the wheels concerned until one wheel locks.

38.4.6.3.6.              For the purpose of testing the suspension shall be installed in a typical trailer application, be fitted with 'Axles', wheels and tyres of a size appropriate to the mass rating of the suspension, and be fitted with identical calibrated 'Brakes' at each 'Axle'.

"Calibrated" in this case means that the relationship between the input 'Control Signal' and the output torque for the 'Brakes' on each 'Axle' has been measured. 'Skid limits' may be determined either dynamically or at a low speed under drag conditions, in either case at a test mass not less than one half 'GGALR'.

Note. Rigid 'Drawbar'/chassis installations will not be considered as typical of installations on 'Pig Trailers' having a pivoted 'Drawbar'.

38.5.                                ALTERNATIVE STANDARDS

(Refer to clause 38.3.1.2.)
APPENDIX 1

'ANTILOCK SYSTEM' FOR TRAILERS DESIGNED FOR USE IN 'B-DOUBLES'

       A.1 PERFORMANCE REQUIREMENTS

       A.1.1  Trailers designed for use in 'B-Doubles' which incorporate one or more 'Antilock Systems' must meet the following requirements:

       A.1.1.1  The 'Brake System' of trailers must comply with the requirements of ADR 38/00 with the 'Antilock Systems' operational.

       A.1.1.2  At speeds exceeding 15 km/h the wheels on the 'Axle(s)' specified in clause A.2.1 must remain unlocked when a 'Control Signal' of 1 '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.

       A.1.1.2.1  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 ADR 38/...

       A.1.1.2.2  Brief periods of locking of the wheels are allowed, but stability must not be affected.

       A.1.1.3  In the event of failure of an 'Antilock System', the braking performance of