5.ADDITIONAL CHECKS
5.1.The following additional checks must be carried out with the vehicle unladen.
5.1.1.Any wheel controlled by an anti-lock device must not lock when the full force(1) is suddenly applied to its control device, on the two kinds, of road surface specified in 4.1.2 at initial speeds of up to 0,8 Vmax but not exceeding 80 km/h(2).
5.1.2.Where a wheel controlled by an anti-lock device passes from a high-adhesion surface or a low-adhesion surface as described in 4.1.2 with the full force(1) applied to the control device, the wheel must not lock. The running speed and the instant of applying the brakes must be so calculated that, with the anti-lock device fully cycling on the high-adhesion surface, the passage from one surface to the other is made at about 0,5 Vmax not exceeding 50 km/h.
5.1.3.Where a vehicle passes from a low-adhesion surface to a high-adhesion surface as described in 4.1.2 with the full force(1) applied to the control device, the deceleration of the vehicle must rise to the appropriate high value within a reasonable time and the vehicle must not deviate from its initial course. The running speed and the instant of applying the brakes must be so calculated that, with the anti-lock device fully cycling on the low-adhesion surface, the passage from one surface to the other occurs at about 0,5 Vmax not exceeding 50 km/h.
5.1.4.Where both independent braking devices are equipped with an anti-lock device the tests prescribed in 5.1.1, 5.1.2 and 5.1.3 must also be performed using both independent braking devices together, the stability of the vehicle being maintained at all times.
5.1.5.However, in the tests provided for in 5.1.1, 5.1.2, 5.1.3 and 5.1.4, periods of wheel locking or of extreme wheel slip are allowed provided that the stability of the vehicle is not adversely affected. Below vehicle speeds of 10 km/h wheel locking is permitted.
(1)
Full force means the maximum force prescribed in Section 2.4, Appendix 1 for the category of vehicle: a higher force may be used if required to actuate the anti-lock device.
(2)
On low adhesion surfaces (≤ 0,35) the initial speed may be reduced for safety reasons: in such cases, the K value and the initial speed must be noted in the test report.