A vacuum generating assembly, comprising: a rotary input member connectable to an engine rotary power takeoff ; a vacuum pump having a rotor that is rotatable to generate a vacuum; a wrap spring clutch coupling the rotary input member and the vacuum pump rotor , wherein the wrap spring clutch is positionable in an engaged position, in which the wrap spring clutch operatively connects the rotary input member and the vacuum pump rotor , and a disengaged position, in which the wrap spring clutch operatively disconnects the rotary input member and the vacuum pump rotor ; a vacuum actuator connectable to a vacuum conduit and operatively connected to the wrap spring clutch , wherein the vacuum actuator is movable, based on air pressure in the vacuum conduit , between a low-pressure position in which the vacuum actuator positions the wrap spring clutch in the disengaged position, and a high-pressure position in which the vacuum actuator positions the wrap spring clutch in the engaged position; a clutch control member connected to the wrap spring clutch ; and a brake that is positionable in a non-braking position in which the brake permits the clutch control member to be driven by the rotary power takeoff , thereby permitting the wrap spring clutch to remain in the engaged position, and in a braking position in which the brake retards rotation of the clutch control member relative to the rotary power takeoff , bringing the wrap spring clutch to the disengaged position, wherein the vacuum actuator is operatively connected to the brake , such that movement of the vacuum actuator to the low-pressure position positions the brake in the braking position, and movement of the vacuum actuator to the high-pressure position positions the brake in the non-braking position. a rotary input member connectable to an engine rotary power takeoff ; a vacuum pump having a rotor that is rotatable to generate a vacuum; a wrap spring clutch coupling the rotary input member and the vacuum pump rotor , wherein the wrap spring clutch is positionable in an engaged position, in which the wrap spring clutch operatively connects the rotary input member and the vacuum pump rotor , and a disengaged position, in which the wrap spring clutch operatively disconnects the rotary input member and the vacuum pump rotor ; a vacuum actuator connectable to a vacuum conduit and operatively connected to the wrap spring clutch , wherein the vacuum actuator is movable, based on air pressure in the vacuum conduit , between a low-pressure position in which the vacuum actuator positions the wrap spring clutch in the disengaged position, and a high-pressure position in which the vacuum actuator positions the wrap spring clutch in the engaged position; a clutch control member connected to the wrap spring clutch ; and a brake that is positionable in a non-braking position in which the brake permits the clutch control member to be driven by the rotary power takeoff , thereby permitting the wrap spring clutch to remain in the engaged position, and in a braking position in which the brake retards rotation of the clutch control member relative to the rotary power takeoff , bringing the wrap spring clutch to the disengaged position, wherein the vacuum actuator is operatively connected to the brake , such that movement of the vacuum actuator to the low-pressure position positions the brake in the braking position, and movement of the vacuum actuator to the high-pressure position positions the brake in the non-braking position. <EOS>