TM 55-2210-223-34
TO 45A2-2-14-22
4-12.
INDEPENDENT BRAKE VALVE (cont)
TEST (cont)
(3) Pressing the independent brake handle when the handle is in RELEASE position will cause release of any
automatic brake application existing on the locomotive. The valve functions as follows:
(a) Main reservoir air will flow into port 13 which, in turn, is connected to port 10 of the H-5 relay air valve.
(b) When air pressure in port 10 exceeds the strength of the valve return spring, port 11 is connected to 9
and atmosphere.
(c) Air in application chamber port 2A is exhausted through port 2 at H-5 relay air valve port 9.
(d) Air in the brake cylinder will, in turn, be vented at the 6-NFR distributing valve BC exhaust.
(e) Pressing of the independent brake handle with it somewhere in the application zone will release the
automatic application only to the value corresponding to the position of the handle in the application
zone.
4-57
