The invention relates to a compressed air system 2 for a vehicle 4 whereby the compressed air system 2 comprises at least one compressed air reservoir 12, a compressor 14 intended for filling the compressed air reservoir 12, and whereby the compressed air system 2 further comprises a signal unit 18 initiating overfilling of the compressed air reservoir 12 before a compressed air offtake, and a method for air pressure control for a vehicle 4 with a compressed air system2, whereby the compressed air system 2 is prepared for future pressure offtake, and whereby a signal 28,50 representing a future pressure offtake is sent to a control unit 16, followed by a signal 42,54 being sent from the control unit 16 to the compressor 14 to order overfilling of at least one compressed air reservoir 12.
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