4-32. FRONT AXLE-Continued
4-32.5 Brake Assembly-Continued
Inspect air chamber bracket (17) for cracks or bends.
Inspect air chamber (24) for leaks, bent push rod, loose
clamp ring, clogged vent, or housing damage. If air chamber
is damaged remove nuts (20) and washers (21) and
disconnect brake chamber air line (29). If bracket (17) is
damaged or ball socket assembly is being replaced, remove
capscrews (18), washers (19) and disconnect brake air line
Inspect brake spider (22) for cracks at bolt holes, cam area,
or around anchor pin. If replacement of the spider or ball
socket assembly is required remove capscrews (23) and
washers (27) and remove both wheel spindle (30) and spider
Inspect anchor pin (A). If pin is loose or grooved more than
0.03 in. (0.8 mm) below original surface, replace the spider.
Inspect brake shoes (1 and 2) and replace if lining is
contaminated, cracked, or worn to 3/16 in. (4.5 mm) thick at
any point, or if rivets are less than 1/16 in. (1.6 mm) below
surface of lining.
Check brake shoes for bent or cracked webs or table. Check also for broken weld seams, loose rivets, or
elongated rivet holes. Replace shoes if any of these conditions are found.
Inspect camshaft (13). Check for damaged or worn splines, corroded or worn bearing journals, brinelling,
cracks, or flat spots on camshaft head. Replace camshaft if worn or defective.
To carry out the following inspection procedure, the camshaft, brake spider, and slack adjuster
including normally used shim washers must be assembled as shown.
Mount a suitable dial indicator with the plunger referencing the cam head at 90 deg.. from cam face.
Pull camshaft inward, i.e., cam head toward spider, to take up any end play and set dial indicator to zero.