Specifications

Brake assessment manual Ver 1.0 Published October 2013 41 (48 pages)
Test I: Wheel lock procedure
[Based on: ADR 31/01, Appendix A, Annex 5, Appendix 1.]
This test is intended to check that the front wheels lock before the back wheels.
The test shall to be done with the vehicle both in the MLTM and LLTM condition, travelling at
65km/h and at a braking rate of less than 0.5 m/s
2
This test shall be done with Cold Brakes. The average temperature of the service Brakes on
the hottest Axle of the vehicle, measured inside the brake linings or on the braking path of
the disc or drum, must be between 65 ºC and 100 ºC prior to any brake application.
The braking manoeuvre shall be done on a surface with a low coefficient of friction, eg grass
or very wet road (it may be necessary to wet the test area.)
The test is intended to ensure that lockup of both front wheels occurs at a lower deceleration
rate than the lockup of both rear wheels when tested on road surfaces on which wheel
lockup occurs at braking rates between 0.15 m/s
2
and 0.5 m/s
2
.
A simultaneous lockup of the front and rear wheels refers to the condition when the time
interval between the lockup of the last (second) wheel on the rear Axle and the last (second)
wheel on the front Axle is less than 0.1 seconds for vehicle speeds greater than 30 km/h.
Wheel lock of the front wheels before the rear wheels must be visibly evident to the naked eye.