Parking brakes/clamps are designed to immobilise a previously stopped machine or to bring it to a complete stop at a previously reduced rotational speed.
They are mainly used in fan drives, as brakes that block their movement caused by ”back draft” or in other similar devices.
They can be fitted with an electric drive (AHN, ZHE) or use a manual drive (AHR, ATR, ZHR). When using a brake equipped with an electrohydraulic thrustor (AHT holding drum brake – see B1-16), it is necessary to supply power to the thrustor at all times when the machine is stationary.
