If you are using a two relays or contactors for reversing the relay that Gar suggests goes between the reverser and the motor, the motor is disconnected from the reverser when braked.
The advantage on this method is that it is active after the power is removed and reduces back-feeding etc.
Try shorting the motor terminals together and turn the actuator or motor shaft if possible, you will see the effect.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.