Division 5.2.4.1

The low energy value referred to in point 5.2.4 shall be that at which, without re-charging of the energy reservoir and irrespective of the load condition of the towed vehicle, it is not possible to apply the service braking control device a fifth time after four full-stroke actuations and obtain at least 50 % of the prescribed performance of the service braking system of the relevant towed vehicle.