parking brake part for my class C

In addition to the ratchet on the pedal movement, Fords have a device that grabs the parking brake cable like an old Chinese finger trap. Just getting some WD-40 up in there might free the cam arrangement that does the grabbing. No, the WD-40 won't make the cable slip. Have to do this every few years on my old 93 Bronco. And, yes, those things are getting really scarce. People replaced many that really only needed lubrication.