Component Cause Action
Air Chamber Pushrod Binding on chamber housing Check adjuster for proper shimming and air
chamber position for proper adjuster arm length
Air Chamber Return Springs Broken, weak, missing Replace chamber
Air System Not exhausting completely Check for cause of air problem and repair
Automatic Brake Adjuster Unknown Check automatic brake adjuster for proper
installation (refer to Pages 4 & 5 and 9 & 10).
Camshaft Binding Remove, replace, lubricate camshaft
Camshaft Bushings Excessive movement Remove and replace cam bushings per OEM specs
Binding shaft Lubricate camshaft bushings or replace
Shoe Return Springs Broken, weak, missing Replace springs
Component Cause Action
Automatic Brake Adjuster Unknown Check automatic brake adjuster for proper
installation (refer to Pages 4 & 5 and 9 & 10).
Wheel Bearing Out of adjustment Readjust wheel bearing per OEM specs
Free Stroke Above The Range
If the free stroke is above the range and the applied stroke is too long, there is a problem with the
foundation brake or the adjuster. Check the following and reference CVSA out-of-service criteria:
Free Stroke Below The Range
If the free stroke is less than 3/8”, a dragging brake can occur. Check the following and reference
CVSA out-of-service criteria:
Free
Stroke = B minus A
A
(Fully Retracted)
B
(Drum Contact Using a Lever)
C
(Brake Application at 90-100 PSI
reservoir pressure.)
Figure 13
Stroke Measurements
(taken from face of air
chamber to center of
clevis pin)
8
Free Stroke (cont’d)
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