Ko se pri motornem vozilu, ki lahko vleče priklopno vozilo kategorije O 3 ali O 4, opremljeno s pnevmatskim zavornim sistemom, pri preskusu prekine vir energije, blokira napajalni vod in poveže upravljalni vod s posodo prostornine 0,5 litra, sistemu pa se dovaja vklopni in odklopni tlak, mora biti tlak pri polni uporabi naprave za upravljanje med 6,5 in 8,5 bara na spojnih glavah napajalnega in upravljalnega voda ne glede na obremenjenost vozila.
In the case of a motor vehicle authorised to draw trailers of category O3 or O4 fitted with compressed air brake systems, when tested with the energy source stopped, the supply line blocked off and a reservoir of 0,5 litre capacity connected to the control line, and the system at cut-in and cut-out pressures, the pressure at full application of the braking control must be between 6,5 and 8,5 bar at the coupling heads of the supply line and the control line, irrespective of the load conditions of the vehicle.