| 5.1.3.7.3. | When the power-driven vehicle is equipped according to paragraph 5.1.3.1.3. or, if it satisfies the requirements of paragraph 5.2.1.18.2. without assistance from the pneumatic control line, paragraph 5.1.3.1.2., the actuation of the parking braking system on the power-driven vehicle shall actuate a braking system on the trailer via the electric control line. When the electrical energy for the braking equipment of the power-driven vehicle is switched off, the braking of the trailer shall be effected by evacuation of the supply line (in addition, the pneumatic control line may remain pressurized); the supply line may only remain evacuated until the electrical energy for the braking equipment of the power-driven vehicle is restored and simultaneously the braking of the trailer via the electric control line is restored. | a0c0 |