Grabby Front Disc Brakes

[wgr2112]

A couple of months ago, I replaced the front pads on my 72 C10.

After compressing the pistons and installing pads and "self bleed" bleeder screws, I bled the brakes.

With the crappy weather, I haven't driven it much.

When I apply the brakes, the fronts lock up occasionally and the pedal seems pretty stiff.

Is it time for new calipers? I'm guessing they're pretty old, if not original.

I also thought about replacing the Master Cylinder and booster when I clean up the engine compartment.

Thoughts?