Reactionary linkage seizing

[Keith Webb]

I have experienced a problem with the brakes on the FGT (which is fitted with the booster) where the pedal which does not return when it is released.

At first I thought there may be a problem with the booster, but releasing that made no difference. Having a closer look underneath, it seems the reactionary linkage(part 2514 in the exploded view) has become very tight on the shaft (2482). The brake operating arm (1966) which looks like a tuning fork and is the actual part with the rod pushing into the master cylinder moves freely.

I've tried liberal application of cat piss (penetrating fluid) and working it back and forward but this is very tiresome on your own as you're constantly under the truck then into the seat to push the pedal.
I'm thinking perhaps once the volatile parts of the cat piss have evaporated to try some heat.
Anyone else experienced this? It appears to be one of the more annoying things about not using a vehicle for far too long... although I don't think I have seen this happen on any of the wrecks I've encountered through the years.