1. Check that brake chambers are in fully released position.
2 . Before installing adjusters, inspect condition of foundation brake and check for any needed repair or
adjustment such as:
a. B r a c k Drums-cracked or out-of-round.
Brake Shoes-loose linings, broken return springs, anchor pins.
C a m s h a f t Bushings-worn, cracked, seized.
Camshaft Splines-cracks, broken teeth, burrs.
Brake Chamber-mounting bolts, equal push rod length, alignment.
f. P u s h r o d
3. Assemble control arm anchor bracket onto the stationary member but do not tighten.
4 . Install slack adjuster on camshaft spline with adjusting hex pointing away from brake chamber. Use
c a m s h a f t spacing washers to align slack adjuster with clevis and achieve proper end play clearance (ap-
proximately .030" to .060") without binding. Secure slack adjuster on camshaft with standard retainer.
5. Pull slack adjuster in the breaking direction by hand and release to verify the assembly is free to return
to full off position.
6. Using a 12mm wrench, manually rotate adjusting hex (A) clockwise until clevis pin holes in adjuster arm
(B) and brake chamber push rod clevis are aligned. Install clevis pin (C) and retainer (CAUTION: do not push
level arm into clevis, or pull out chamber pushrod to align pin holes). Check that clevis yoke jam nut (D) is
Figure 1 Installation of chamber Push Rod Clevis on Adjuster