TM 9-2350-247-20-1
TOWED LOAD BRAKES DO NOT OPERATE WHEN PEDAL IS PRESSED;
AIR PRESSURE ADEQUATE (M548A1)
0099 00
INITIAL SETUP:
Maintenance Level
Unit
Tools and Special Tools
General Mechanic’s Tool Kit (WP 0541 00, Item 57)
Personnel Required
Unit Mechanic
References
See your -10
Equipment Condition
Engine stopped (see your -10)
Carrier blocked (see your -10)
T
1. Start engine (see your -10).
2. Check for faulty treadle valve (1).
3. While observing air indicator gauge, press brake pedal and
release. Pressure should momentarily drop and stabilize. Air will
also audibly exhaust from treadle valve (1) as air brake pedal is
released. If no needle movement is noted, treadle valve is faulty.
4. Did treadle valve (1) cause needle movement?
YES
NO
TN
1. Stop engine (see your -10).
2. Notify your supervisor.
Y
1. Check air lines, tubings, fittings, and coupler to towed load for air
leaks.
2. Is brake system free of air leaks?
YES
NO
YN
1. Stop engine (see your -10).
2. Replace faulty parts (WP 0495 00).
3. Verify no faults found.
0099 00-1
