disassembling type-44 rear calipers

[Ameer Antar]

Does anyone know how to take apart the rear brake calipers for a 5000? I need
to take out the rubber seals before getting them coated, but the parking brake
mechanism doesn't seem to want to come out after taking the spring out. There's
a large snap-ring deep inside the piston bore; is this necessary to remove the
parking brake mechanism? Also what kind of tool could I use on that? The
snap-ring pliers I have are to wide and short to reach all the way into the
bore. I haven't been able to find a set of long nose snap-ring pliers. Any
advice is much appreciated.
 
-Ameer