1992 ford ranger stx cluth question

my brother has a 92 ford ranger stx and the clutch has started to give him some problems. from what he says in the cold the clutch doesn't want to fully disengage and it's hard to put into gear but as it warms up it works better. he's wanting to get it over here one day soon for me to look at good but i haven't got much experience with standard transmissions.
i did check the clutch master cylinder fluid level real quick but it wasn't very low at all so i just topped it off. has any body else had this problem? some pointers on what things i should check first or what causes that would be greatly appreciated. thanks and happy holidays all! :confused:

so i guess the clutch fluid has a slight leak... he says since we topped off the fluid the truck has done great... guess he'll keep an eye on that...