4-36. PUSHROD TRAVEL TEST AND BRAKE ADJUSTMENT (Cont).
Uncouple semitrailer from towing vehicle (para 2-11).
Open draincock on air reservoir and release air pressure.
Raise rear of semitrailer with jack until tires clear the ground
Support semitrailer with jackstands.
Try to laterally rock wheel, hub, and brakedrum assembly on axle spindle. If rocking
condition exists, perform step 4. If not, go to step 5.
Check wheel bearing adjustment (para 4-48).
Turn brakeshoe adjusting screw (5) clockwise,
until front brake lining contacts brakedrum and
wheel drags slightly when turned by hand.
Back off adjusting screw (5) just enough until
wheel rotates freely.
Repeat steps 5 and 6 for adjusting screw (5) and
rear brake lining.
Repeat steps 4 through 7 on all other wheels.
Make both adjustments at each wheel as uniform
Close draincock on air reservoir. Raise semitrailer,
remove jackstands, and lower semitrailer to the
l Couple semitrailer to towing vehicle (para 2-10).