"Chet" wrote in
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Hi Guys!
I run a 1/8 scale live steam locomotive.
While testing the vacuum brakes on my tender,
I blew out the diaphrams that activate its
brakes.
The original unit was used as a vacuum advance
for old-time carburetors and is now an
endangered species.
Anybody have success making their own from
scratch?
If so, would you be willing to share the
process?
Thanks in advance,
Chet (engineer of ANCR Mogul #9401)

Dodge K cars use a vacuum actuator on the
heater/defrost door that is just a little bigger
than an old vacuum advance, and it has a rod
sticking out of it that is attached to the
diaphram that's easy to adapt to whatever.