In the second to last photo, it looks like the clutch master may be leaking. The rust on the lowest stud head (bracket through firewall) and what looks like a stain on the pad under the master. Also in another photo you can see rust on the shaft where it comes through the rear dust boot on the master.
It might help to bleed the system, but in my experience there is a considerable possibility of the bleeding process to contribute to the rapid and sometimes immediate failure of the master cylinder.
If the reservoir for the master cylinder is low then that would confirm a leak. Make sure it has enough fluid, but bleeding a master that old is a crap shoot.
regards
mech
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