Midland SIDE DUMP GRAVEL TRAILER Operator's Manual page 80

5.2.9 SLACK ADJUSTERS (cont'd)
5.2.9.2 AUTOMATIC SLACK ADJUSTER
MAINTENANCE (cont'd)
FAILURE ANALYSIS
Automatic Slack Adjuster Failure Analysis
If the power stroke is at or more than the maximum
stroke, measure free stroke to determine if the slack
adjuster is operational.
FREE STROKE MEASUREMENT
Free stroke is the amount of slack arm movement
required to move the brake shoes against the drum.
To measure free stroke, perform the following:
1. With brakes released, measure from the brake
chamber face to the center of the clevis pin.
2. With a lever, pry the slack adjuster arm untilthe
brake shoes contact the drum and measure the
slack adjuster movement (see Fig. 72).
3. The difference between the brake released and
applied measurements is the free stroke. The
free stroke should be 3/8" - 5/8". If the free
stroke is in the correct range, the out of spec
stroke is due to a foundation brake problem.
Check for missing or worn components, cracked
brake drums, or improper lining-to-drum contact.
If the free stroke is greater than recommended,
an automatic slack adjuster function test should
be performed.
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Fig. 60 FREE STROKE