manual brakes need a MC with the machined circular groove in the rear piston "thimble" about halfway down for the snip of neoprene retainer on the manual brake pushrod to lock into. PB do not require this "groove" but can use a MC with this groove. all that is left is the bore dia and as mentioned possibly a pedal swap to change the ratio (if needed). if the MC has the groove & it is in good shape I would try it & if the pedal effort and or pedal travel is unacceptable then purchase a different one.