LSP motor mount with brake -need HELP-

I have a problem with RC-monster's motor mount for Hot Bodies Lightning Stadium.

Bought it with the idea of using the mechanical brakes, but I cannot.

The problem is that I can´t fit the mechanical brakes: the holes are too low (a few milimeters) and touchs the brake pads mount.

.... or maybe I am doing something wrong.

Here are a few pics.





Is anyone using the mechanical brakes with this motor mount?