ness appears excessive. Make certain the brake
actuator pushrod jam nut is tightened securely.
2. Inspect the slack adjuster for physical damage,
paying attention to the link, boot, and clevis. If
any components are damaged, repair or replace
them as necessary.
3. Measure the brake actuator pushrod stroke while
making an 80 to 90 psi (552 to 621 kPa) brake
application. Actuator pushrod strokes should not
exceed the values shown in
Table 2 and
Table 3. To achieve the correct pressure for this
test, build the system pressure up to a 100 psi
(690 kPa). Shut down the engine. Fan the
brakes to attain a 90 to 95 psi (621 to 655 kPa)
reading. Make and hold a full brake application
while the strokes are checked.
Actuator Stroke–Standard Stroke
Brake Actuator Size
Recommended Maximum
Operating Stroke (Inches)
30 2
24 1-3/4
20 1-3/4
16 1-3/4
12 1-3/8
Table 2, Actuator Stroke–Standard Stroke
Actuator Stroke–Long Stroke
Brake Actuator Size
Recommended Maximum
Operating Stroke (Inches)
30 Long Stroke 2-1/2
24 Long 2
24 Long Stroke 2-1/2
20 Long 2
16 Long 2
Table 3, Actuator Stroke–Long Stroke
Brakes42
Century Class Trucks Maintenance Manual, January 201642/12
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