the backing plate; (3) the contact surface of the anchor pin plate and backing
plate; and (4) the anchor pin threads.
For intial adjustment of the brake shoe and lining assemblies, insert a feeler
gage between the lining and drum nearest the shoe adjusting eccentric. Turn
the eccentric clockwise and obtain a 0.008-inch clearance between lining and
drum. Tighten the eccentric nut.
The feeler gage must be a snug fit and must extend through
the entire width of the lining. Clearance is to be deter-
mined at the closest point in full width.
Insert a feeler gage between the lining and drum nearest the anchor pins.
Adjust the anchor pins and obtain a 0.005-inch clearance between the lining
and drum. Tighten the anchor pin nut.
7-16. Proper brake action and proper brake lining contact is obtained by adjustment
at three points. These are the knurled brake handle, the brake shoe adjusting eccen-
trics (cams), and the rod and clevis connections of the brake linkage. The following
steps outline the procedure for complete adjustment of the brake system.
Mount the aft end of the trailer on a suitable support with the tires clearing the
ground. Block the front tires.
Release the parking brakes (brake handle down).
Turn the burled adjustment section of the brake handle counterclockwise and
release all tension in the brake linkage.
Hold the adjusting cam in position with an open-end wrench, and loosen the cam
Spin the wheel and turn the adjusting cam in the proper direction to expand the
brake shoe until a heavy drag is reached, then gradually turn back the adjusting
cam until the wheel turns freely.
Make this adjustment at the top and bottom cams for each brake shoe.
adjusting cam in position and tighten the cam locking nut.