Chet wrote:
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)


What size is the old one? I could bet a cruise actuator or the 4X4
actuator from an S series GM would work. Or you could find a dashpot
from the HVAC controls of 99% of the cars out there, just look behind
the dash on the heat ducting.

--
Steve W.