BENDIX ASA-5 AUTOMATIC SLACK ADJUSTER Manuel - Sayfa 10

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ASA-5

SLACK ADJUSTER TROUBLESHOOTING CHART (Continued)

SYMPTOMS

2. Brakes dragging—

apparent

over-adjustment of

brakes.

CAUSE

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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

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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.