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TM 9-2330-398-24
2-60.
RELEASE OF FAIL-SAFE CHAMBER BRAKES (continued).
NOTE
When filling through filler valve, only forward (secondary) air reservoir is filled.
2.
When pressure falls under 55 psi (379 kPa), forward (secondary) air reservoir must be recharged either by
connecting air lines to prime mover or by using a standard air hose and filling reservoir through filler valve (2).
3.
Fill to air gage reading between 90 and 100 psi (621 and 690 kPa). A standard tire gage can be used to check
pressure.
b.
MANUAL RELEASE (CAGING)
NOTE
Manually release (cage) fail-safe brakes when no air is available.
1.
Block wheels to prevent movement of semitrailer.
2.
Unsnap breather cap (3) from each of four fail-safe units (4) and insert manual caging tool (6) into access hole (5).
3.
Turn nut on manual caging tool (6) clockwise until brakeshoes are released on each brakedrum.
CAUTION
Do not leave breather caps off any longer than necessary. Water, mud, and other contaminants
can harm the operation of brake actuator. Vent on breather cap must be at the lowest location
pointing down.
4.
As soon as air is available to refill the reservoirs, turn nut on manual caging tool (6) counterclockwise until each of
four fail-safe units (4) are released. Snap breather caps in place on fail-safe units (4).
FOLLOW-ON MAINTENANCE:
• Disconnect ground (refer to TM 9-2330-398-10).
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