I need a set of Brake Adjuster Push Rods for my '84 Vanagon.  Mechanic
says current Brake Adjuster Push Rods are frozen and rear brakes cannot
be adjusted.  Apparently, these parts are difficult to come by and may
be NLA.  Are there any available?  Van is down as rear wheel cylinders
are leaking and need to be replaced, but push rods are apparently a
problem replacing wheel cylinders.

Presumably, current set of adjuster push rods are frozen because of
corrosion / dirt.  Is there a way of unfreezing them?

Thank you,

John