I bought a second-hand bike. It has linear pull brakes. There is a tubular mount made of steel with a male thread which screws into the rear triangle of the bike's aluminum frame. Each brake is secured to such a mount with a hex-socket cap screw that threads into the mount's female-threaded tube.
There was orange loctite on that hex socket cap screw, which caused the entire mount to spin in the frame when the screw was turned, rather than the screw coming out of the mount.
Once I got the entire brake assembly out of the frame I was able to break the loctite bond by holding the mount on its (very skinny) wrench flats and then turning the socket cap screw CC.
Question: Should I put some Loctite (blue? orange?) on the mount itself so it is secured in the frame? Are there any issues when dissimilar metals, steel and aluminum, are bonded with Loctite?