| 5.2.1.4. | The service braking system shall, whether or not it is combined with the secondary braking system, be such that in the event of failure in a part of its transmission a sufficient number of wheels are still braked by actuation of the service brake control; these wheels shall be so selected that the residual performance of the service braking system satisfies the requirements laid down in paragraph 2.4. of Annex 4 to this Regulation. | a0c0 |