brakes seizing up on older motorhome.

I have a similar problem with my '84, but it appears to be limited to the right front caliper which causes the stiffening of the pedal. It came on out of the blue and I haven't been able to figure it out. New calipers, rotors, pads, MC and soft hoses. If it were all brakes I'd suspect something in the Hydroboost system but it's just the right front. I just live with it. It never locks up completely and frees up after a little bit of non-braking travel.

Sorry I don't have an answer but subscribing for replies....