BENDIX ASA-5 AUTOMATIC SLACK ADJUSTER Manuale - Pagina 10
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™
ASA-5
SLACK ADJUSTER TROUBLESHOOTING CHART (Continued)
SYMPTOMS
2. Brakes dragging—
apparent
over-adjustment of
brakes.
10
CAUSE
™
A. ASA-5
slack adjuster
improperly installed. Too
close to actuator: brakes
can't fully release.
B. Loose actuator push rod
jam nut.
C. Spring brakes not fully
retracting.
D. Broken foundation brake
components, including
camshaft bushings.
E. Vehicle brake torque
imbalance. (More work
done by some brakes
than others, thermal
expansion of drums).
F. Brake drum out-of-round,
excessive thermal
expansion.
G. Air system malfunction,
not exhausting
completely.
H. New lining swells during
break-in.
REMEDY
™
A. Correct the ASA-5
slack adjuster installation.
B. Reposition components and torque to
specification.
C. Check spring brake release air pressure and
repair or replace air valving as necessary. Repair
or replace spring brake.
D. Repair or replace as required per In Service
Inspection.
E. Check other brakes to ensure they are working.
Check air pressure balance and threshold pres-
sure (refer to Bendix publication BW-1555). Check
driver braking habits, e.g. use of trailer control
valve. Use same friction material on all axles.
F. Replace or repair as required.
G. Inspect and correct.
H. Back-off adjustment until brakes are free.