A vehicle consisting of a tractor and at least one trailer that is mechanically connected to the tractor in order to be dragged in motion, wherein: - the tractor comprises an engine , tractor wheels , at least one tractor brake , which may be actuated in order to brake a particular tractor wheel , a brake assembly , which is provided with a brake pedal in order to actuate the tractor brake to brake, a trailer brake master valve , which is operatively connected to the brake assembly , and an accelerator that is operatively connected to the engine ; - the tractor further comprises electronic management means comprising trailer braking management means and engine management means , said management means being operatively connected to the trailer brake master valve , to the brake assembly and to the engine ; - the trailer comprises trailer wheels and at least one trailer brake that may be actuated in order to brake a particular trailer wheel , wherein the trailer brake is operatively connected to the trailer brake master valve of the tractor by means of a trailer brake circuit and may be actuated when the pressure in the trailer brake circuit is equal to or greater than a braking pressure (Pb) ; - characterised in that the management means are configured to control the trailer brake master valve so as to increase the pressure in the trailer brake circuit from an existing base pressure (P0) to a coasting pressure (Pc), which is smaller than the braking pressure (Pb), when said management means detect a coasting condition in which the speed of the tractor is greater than a limit speed (Vt), the brake assembly does not actuate the tractor brake , and the engine does not supply power to the tractor wheels . - the tractor comprises an engine , tractor wheels , at least one tractor brake , which may be actuated in order to brake a particular tractor wheel , a brake assembly , which is provided with a brake pedal in order to actuate the tractor brake to brake, a trailer brake master valve , which is operatively connected to the brake assembly , and an accelerator that is operatively connected to the engine ; - the tractor further comprises electronic management means comprising trailer braking management means and engine management means , said management means being operatively connected to the trailer brake master valve , to the brake assembly and to the engine ; - the trailer comprises trailer wheels and at least one trailer brake that may be actuated in order to brake a particular trailer wheel , wherein the trailer brake is operatively connected to the trailer brake master valve of the tractor by means of a trailer brake circuit and may be actuated when the pressure in the trailer brake circuit is equal to or greater than a braking pressure (Pb) ; - characterised in that the management means are configured to control the trailer brake master valve so as to increase the pressure in the trailer brake circuit from an existing base pressure (P0) to a coasting pressure (Pc), which is smaller than the braking pressure (Pb), when said management means detect a coasting condition in which the speed of the tractor is greater than a limit speed (Vt), the brake assembly does not actuate the tractor brake , and the engine does not supply power to the tractor wheels . <EOS>