Originally Posted by
Little Darwin
My guess based on the pivot point for the retainer on the left is that it is a strange brake that has the slot under the cable instead of over the cable... but I don't see one there in the pic. Have you looked there to see if it is unusually situated?
....
A slot under the clip wouldn't serve much purpose since the cable and noodle would still be trapped. To serve the purpose the slot would have to be at the top.
Replacing the brake is always an option, but I'd just go ahead and cut a slot and solve the problem for now.