Method for regenerating a compressed air supply device of a commercial vehicle, wherein the compressed air supply device comprises an air drier and is suitable for supplying a first pneumatic circuit and a second pneumatic circuit with compressed air, wherein a predetermined maximum pressure value (Pmax) is assigned to the first pneumatic circuit, the method comprising the steps of: supplying the first pneumatic circuit with compressed air until the pressure in the first pneumatic circuit has reached a predetermined target pressure (Ps); followed by supplying the second pneumatic circuit with compressed air; characterised in that between the steps of supplying the first pneumatic circuit and supplying the second pneumatic circuit, the following intermediate steps are carried out: regenerating the air drier with compressed air from the first pneumatic circuit if the pressure in the first pneumatic circuit has reached the target pressure value (Ps) and a humidity value of the air drier exceeds a predetermined target humidity value (Fz); terminating the regeneration if the pressure in the first pneumatic circuit has dropped to a predetermined limit pressure value (Pg) or the humidity value of the air drier has reached or fallen below the target humidity value (Fz); supplying the first pneumatic circuit with compressed air until the first pneumatic circuit has reached the target pressure value (Ps); repeating the above intermediate steps if the humidity value of the air drier is higher than the target humidity value (Fz). supplying the first pneumatic circuit with compressed air until the pressure in the first pneumatic circuit has reached a predetermined target pressure (Ps); followed by supplying the second pneumatic circuit with compressed air; characterised in that between the steps of supplying the first pneumatic circuit and supplying the second pneumatic circuit, the following intermediate steps are carried out: regenerating the air drier with compressed air from the first pneumatic circuit if the pressure in the first pneumatic circuit has reached the target pressure value (Ps) and a humidity value of the air drier exceeds a predetermined target humidity value (Fz); terminating the regeneration if the pressure in the first pneumatic circuit has dropped to a predetermined limit pressure value (Pg) or the humidity value of the air drier has reached or fallen below the target humidity value (Fz); supplying the first pneumatic circuit with compressed air until the first pneumatic circuit has reached the target pressure value (Ps); repeating the above intermediate steps if the humidity value of the air drier is higher than the target humidity value (Fz). regenerating the air drier with compressed air from the first pneumatic circuit if the pressure in the first pneumatic circuit has reached the target pressure value (Ps) and a humidity value of the air drier exceeds a predetermined target humidity value (Fz); terminating the regeneration if the pressure in the first pneumatic circuit has dropped to a predetermined limit pressure value (Pg) or the humidity value of the air drier has reached or fallen below the target humidity value (Fz); supplying the first pneumatic circuit with compressed air until the first pneumatic circuit has reached the target pressure value (Ps); repeating the above intermediate steps if the humidity value of the air drier is higher than the target humidity value (Fz).