If the outer covering is slipping then mix a two pack epoxy and inject it under wherever there are splits, it won't last long but will get you out of trouble.
Regards
Dave
Long post!
Hi a great looking Spanish 80 you have. I I live in Spain and own a 94 1HDT run a garage as well.
Looking at your list:
Brakes pulling to one side, almost certainly stuck pistons, pull the pad on one side of the disc and have someone push the brake pedal GENTLY. This will allow...