The pedal doesn't just squeak, it gets stuck if you push it down far enough.
I will take a look at the cab mounts, that could certainly be the problem. What seems odd to me is the clutch pedal shafts stays pretty well centered in its hole but the brake pedal shaft is at the bottom of the hole when the pedal is extended and moves toward the top as you depress it.
I'll look for any bushings that might be worn as well, thanks for the tips!
