TM 55-2210-223-34
TO 45A2-2-14-22
d. Use the automatic brake valve and make a 10-psi (70 kPa) brake pipe reduction. e. After brake pipe exhaust ceases
to blow, move cutoff pilot valve to OUT position and perform the following:
(1) Make a visual inspection of each brake cylinder and ensure brakes are applied.
(2) Observe brake pipe and brake cylinder gage for 1 minute. Brake pipe pressure leakage must not exceed 5 psi
(35 kPa) in one minute. Brake cylinder pressure should indicate between 10 and 25 psi (70 and 175 kPa).
(3) Observe equalizing reservoir gage for 1 minute. No drop in equalizing reservoir pressure is allowed.
(4) Press independent brake valve handle down for 7 seconds. Ensure brakes release.
(5) Move automatic brake valve cutoff valves to IN position and make a 15-psi (85 kPa) brake pipe reduction.
Ensure brakes apply and brake cylinder pressure indicates between 10 to 25 psi.
(6) Move automatic brake valve handle halfway toward RELEASE position. Observe equalizing pointer in main
reservoir/equalizing gage. Ensure there is no rise in pressure. Any rise in pressure shall require repair of
automatic brake valve, distributing valve, and/or associated piping up to the angle cock.
(7) Move isolation switch to RUN position.
(8) Move power throttle to No. 3 position and move automatic brake valve to EMERGENCY position. Observe the
following:
(a) Brake pipe pressure reduces rapidly to zero.
(b) Equalizer reservoir pressure falls to zero in 3 to 5 seconds.
(c) Brake cylinder pressure builds up at a rapid rate to no more than 68-72 psi .
(d) PC switch contacts have disengaged and PC light is on.
(e) Engine rpm reduces to IDLE.
(f) Sanders are actuated.
(9) Press independent brake valve handle down. Ensure brakes release.
(10) Release independent brake valve handle. Ensure brakes apply.
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