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Page Title:
FRONT AND REAR SERVICE BRAKES RELEASE SLOWLY |
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 TM 9-2320-285-24-2
3-21. TREADLE VALVE AND BRAKE CONTROLS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7
FRONT AND REAR SERVICE BRAKES RELEASE SLOWLY
Check if all brakes release slowly.
a
If front and rear brakes release slowly, repair brake treadle valve (para 3-23).
b
If front brakes release slowly and rear brakes release normally, proceed to Malfunction 8, step 1
below.
c
If rear brakes release slowly and front brakes release normally, proceed to Malfunction 9, step 1
below.
8
FRONT SERVICE BRAKES RELEASE SLOWLY
Step 1
Disconnect supply and delivery air lines from ratio reducing valve (para 2-51a).
Connect supply air line to delivery air line.
Check release time of front service brakes.
a
If brakes release normally, repair or replace ratio reducing valve (para 3-24f).
b
It brakes do not release normally, proceed to step 2 below.
Step 2
Replace relay valve (para 3-24g).
Check release time of front service brakes.
a
If front service brakes on both sides release slowly, repair brake treadle (para 3-23).
b
If front service brakes on both sides release normally, no further action required.
c
If front service brake on one side releases normally, and front service brake on other side
releases slowly, repair or replace front axle brake air chambers on affected side (para 2-51d(l)).
9
REAR SERVICE BRAKES RELEASE SLOWLY
Replace service quick release valve (para 3-24b).
Check release time of rear service brakes.
a
If rear service brakes on both sides release normally, no further action required.
3-158
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