In Service Inspection
p4 mm 42.11.001
- Apply and release the brakes several times while observing the slack adjuster. The slack adjuster and brake actuator should move freely, without binding or interference, and should return to the full released position. Observe the looseness that exists between the clevis and adapter bushing and the yoke and link pins and their mating parts (clevis, body, link). Replace these parts if looseness appears excessive. Make certain the brake actuator pushrod jam nut is tightened securely.
- 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.
- 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 and Table . 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.
Table 1, 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 1, Actuator Stroke–Standard Stroke
Table 2, 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 2, Actuator Stroke–Long Stroke
Note: