Division 2.2.2.15

In addition to the above, towed vehicles with hydraulic braking systems shall comply with the following:

1. 2.2.2.15.1.

   In the case that a towed vehicle only complies with the requirements of the service braking system and/or parking braking system and/or automatic braking with the assistance of energy stored in a hydraulic energy storage device, the towed vehicle shall automatically apply the brakes or remain braked when it is not electrically connected (ignition of tractor is switched on) with the energy supply available from the ISO 7638:2003 connector (see also point 2.2.1.18.9). The ISO 7638:2003 connector may be used for 5 pin or 7 pin applications, as appropriate.

   1. 2.2.2.15.1.1.

      F1When the pressure in the hydraulic energy storage devices falls below a pressure declared by the vehicle manufacturer in the information folder where the prescribed braking performance(s) is (are) not ensured this low pressure shall be indicated to the driver by the separate warning signal specified in point 2.2.1.29.2.2 via pin 5 of the electrical connector conforming to ISO 7638:2003.

      F2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

   1. 2.2.2.15.1.1.1.

      F3This low pressure in the hydraulic energy storage devices shall not exceed 11 500 kPa for systems using energy storage devices with a maximum operational pressure of 15 000 kPa.

   2. 2.2.2.15.1.1.2.

      This low pressure in the hydraulic energy storage devices may exceed 11 500 kPa for systems using energy storage devices which are charged to a maximum operational pressure exceeding 15 000 kPa to comply with the prescribed braking performance.

2. 2.2.2.15.2.

   When the supplementary line has fallen to a pressure of 1 200 kPa the automatic braking of the towed vehicle shall start (see also point 2.2.1.18.6).

3. 2.2.2.15.3.

   A device may be installed on the towed vehicle to temporary release the brakes in the case that no suitable tractor is available. The supplementary line shall be connected to this device for this temporary purpose. When the supplementary line is disconnected from this device the brakes shall return automatically to the applied condition again.