BENDIX BW7499 Benutzerhandbuch

1.  Brake Actuator stroke is 

too long.

 

A.  Loose actuator push rod jam nut.

A.   Reposition components and torque to 

specification.

B.  Excessive clearance between adapter/

adapter bushing and yoke due to wear.

B.   Replace damaged or worn parts.

C.  Excessive clearance between 

components: yoke pin — yoke link pin —

link yoke pin — body.

C.  Replace worn parts.

D.  Damaged (worn)  

splines on slack or camshaft.

D.  Replace damaged parts.

E.  Weak or broken brake actuator return 

springs.  Weak or broken brake shoe 

return spring.

E.  Replace weak or broken springs.

F.  Worn or broken foundation brake 

components, including camshaft 

bushings, brake chamber bracket, etc. 

F.  Repair or replace as required per In 

G.  Versajust adjuster mechanism not 

functioning.

G.  Lubricate, test adjuster mechanism, 

conduct in service inspection, repair 

components as necessary, replace.

H.  Brake drum—worn, excessively 

machined, bell-mouthed,  

excessive thermal expansion.

H.  Replace or repair as required.

I.  Damaged Versajust slack adjuster.

I.  Replace component(s) or slack adjuster.

J.   Versajust slack adjuster improperly 

installed.

J.  Correct installation position.

2.  Brakes dragging —

apparent over-adjustment 

of brakes.

A.  Versajust slack adjuster improperly 

installed.  Too close to actuator: brakes 

can’t fully release.

A.  Correct the Versajust slack adjuster 

installation.

B.  Loose actuator push rod jam nut.

B.  Reposition components and torque to 

specification.

C.  Spring brakes not fully retracting.

C.  Check spring brake release air pressure 

and repair or replace air valving as 

necessary.  Repair or replace spring 

brake.

D.  Broken foundation brake components, 

including camshaft bushings.

D.  Repair or replace as required per In 

Service Inspection.

E.  Vehicle brake torque imbalance.  (More 

work done by some brakes than others, 

thermal expansion of drums).

E.  Check other brakes to ensure they are 

working.  Check air pressure balance 

and threshold pressure (refer to Bendix 

publication BW1555).  Check driver 

braking habits, e.g. use of trailer control 

valve.  Use same friction material on all 

axles.

F.  Brake drum out-of-round, excessive 

thermal expansion.

F.  Replace or repair as required.

G.  Air system malfunction, not exhausting 

completely.

G.  Inspect and correct.

H.  New lining swells during break-in.

H.  Back-off adjustment until brakes are free.

BW7499  © 2011 Bendix Commercial Vehicle Systems LLC.  All Rights Reserved.  03/11  Printed in U.S.A.