I have priced up a new motor with a brake built in electromagnetic, coming in at £500 probably go this option cures everything then
What make of motor?
SEW Eurodrive will supply different compression springs for their brake units. You need to attend their training centre to know how to set them correctly.
DC injection as you originally proposed sheared the shaft off a 75HP hoist motor. I’ll leave it to your imagination the damage it caused when the skip ran away.