TM 9-2330-356-14
(2) Check for leakage indicated by bubbles. No
NOTE
leakage is permissible.
It may be necessary to remove the whole
brake assembly from the axle before un-
screwing the brake chamber, due to possible
CAUTION
bracket interference.
DO NOT ovetighten clamp on air chamber.
Maximum torque should be 20-25 lb.-ft. Ov-
(4) Remove brake chamber by unscrewing it from
er-tightening will distort the flange and cause
plunger housing.
more leakage.
(5) At this time the wedge assembly can be
removed for inspection or replacement (para 4-35).
(3) If leakage is found at flange, tighten the
clamp. If leakage is found at connections, tighten fittings.
Repair. Refer repair of brake chamber to direct
c.
support maintenance.
(4) After initial brake application forces out a
small amount of air, no air should be expelled from the air
Installation.
chamber. If air continues to exhaust, repair or
d.
replacement of the air chamber is necessary.
(1) Check position of the wedge in plunger
Removal.
b.
housing to make certain wedge assembly is properly
seated (para 4-35).
(1) Disconnect brake hoses from brake chambers
or relay valve.
(2) Thread collet nut (fig. 4-70) onto housing
tube. Apply a non-hardening sealer (item 25, Appendix E)
(2) Remove U-bolt and two nuts securing
to the first three threads of the housing tube.
chamber to bracket.
(3) With collet nut loose, turn the brake chamber
(3) Use adrift (fig. 4-70), or other blunt tool, and
into the plunger housing until it bottoms.
hammer to loosen the collet nut.
(4) Aline connection ports with brake lines, if
necessary, by unscrewing brake chamber not more than
one full turn.
(5) Install U-bolt and two nuts to secure brake
chamber to bracket.
(6) Connect brake line.
(7) Make and hold a full pressure brake
application. Hand tighten the collet nut. With a drift and
hammer tighten collet nut 1-teeth or additional 3/18 of a
turn. Release brake pressure.
(8) Check for leaks at flange and connections
(step a).
Brake Air Chamber Test and Replacement,
M967A1, M969A1, and M970A1 including
M970 SN TC-0843, TC-0844, and TC-103 thru
TC-178 (Fig. 4-71).
a.
Test.
(1) With towing vehicle connected and vehicle
brakes applied, coat the flanges and connections on the air
chamber with soapy water.
(2) Check for leakage indicated by bubbles. No
M970 except M970 SN TC-0843, TC-0844, and TC-103 thru
leakage is permissible.
TC-178).
Change 3
