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c. Leakage Tests.
(1)
With
air
brake
system
connected
(par.
31b(3)),
ap-
ply soapy water to flanges which hold diaphragm (fig.
13), and to service air line coupling. No leakage is
permitted.  Tighten  nuts  on  flanges  and  tighten  coup-
ling as required.
(2) Coat exhaust check valve (fig. 13) with soapsuds. Ap-
ply brakes.
(3) Release brakes and apply coating of soapsuds to ex-
haust  port.
(4)  With  emergency  relay  valve  in  emergency  position
(b (3) above), coat exhaust port with soapsuds.
(5)
Leakage
tests
((2)-(4)
above)
must
not
exceed
a
1-inch bubble in 3 seconds. If excess leakage is found,
replace
emergency
relay
valve
(d
below).
d.
Semitrailer
M27A1 (fig.
13).
C a u t i o n : Before attempting to remove components of air lines,
release air pressure from system by opening drain cock on air
reservoir.
(1) R e m o v a l . Disconnect
service
and
emergency
air
lines,
and air lines to brake air chambers from elbows at
Disconnect connector of air
emergency  relay  valve.
line leading to reservoir at emergency relay valve. Re-
move
two
hex-head
bolts,
and
hex
nuts
which secure emergency relay valve to cross member
Lift  off  emergency  relay  valve.
of chassis frame.
Position emergency relay valve on cross
(2) Installation.
member and secure with two 3/8 x 1 hex-head bolts,
3/8-inch
and
3/8-inch
hex
nuts.
Position
air  line  to  reservoir  on  emergency  relay  valve  and
tighten  connector.  Connect  air  lines  leading  to  brake
air
chambers
and
emergency
and
service  air  lines  to
Brake operating tests
elbows at emergency relay valve.
and leakage tests (b and c above).
e. Semitrailers M270 and M269 (fig. 12).
C a u t i o n : Before attempting to remove components of air lines,
release air pressure from system by opening drain cock on air
reservoir.
(1) R e m o v a l . Disconnect service and emergency air lines,
and four hose assemblies leading to brake air chambers,
Remove three
at elbows in emergency relay valve.
hex nuts and lockwashers which secure emergency re-
lay
valve
to
studs  in  valve  mounting  bracket  welded
Lift off emergency relay valve and re-
to
reservoir.
TAGO 1321B
97



 


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