BENDIX BW7499 Benutzerhandbuch

of the Versajust slack adjuster toward the released position 

causes the link to rotate the pinion.  The anti-reverse spring 

prevents counterclockwise rotation of the shaft and worm, 

causing the pinion and clutch spring to slip.  The gripping 

action of the anti-reverse spring – and slippage of the clutch 

spring during release – is due to the direction of the coil 

windings of each.

The Bendix

®

 Versajust

™

 slack adjuster may be equipped 

with either of two yoke designs.  Both are designed to permit 

installation or removal of the slack adjuster, along with its 

yoke body and its attached adjusting linkage.

The brake actuator push rod must thread into the adapter a 

minimum of 

1

/

2

 inch and must not extend more than 

7

/

64

 inch 

beyond the other end of the adapter.  The yoke adapters 

(quick connect & easy-on) have either a 1 or 1

1

/

4

 inch hex 

to allow tightening of the brake actuator push rod jam nut.

The easy-on yoke assembly consists of an adapter which 

is threaded internally to match the push rod threads and 

externally to match female threads in the yoke.  A special 

and shaft.  Worm and shaft rotation results in worm gear 

rotation, which in turn adjusts (or repositions) the brake 

camshaft.
When the foundation brake shoes contact the drum, the 

camshaft begins to resist rotation and friction between the 

worm gear and worm builds, preventing further rotation 

of the worm.  Brake adjustment ceases at this point and 

further rotation of the Bendix

®

 Versajust

™

 slack adjuster will 

cause the pinion and clutch spring to slip.  The “free play” 

between the link teeth and pinion results in a predetermined 

lining-to-drum clearance.

When the brake application is released, the brake 

actuator push rod returns the Versajust slack adjuster 

to the released position.  During release, the Versajust 

slack adjuster rotates back toward the actuator causing 

the brake camshaft to again rotate, but in the opposite 

direction, and the brake shoes begin to move away from 

the drum.  As the Versajust slack adjuster rotates back to 

the release position, the yoke again pivots causing the link 

to be pushed downward into the slack adjuster body.  The 

“free play” between the link teeth and pinion is taken up 

during the initial part of the release.  Continued movement 

general precautions should be observed at all times.
1. 

Park the vehicle on a level surface, apply the 

parking brakes, and always block the wheels.  

Always wear safety glasses.

2. 

Stop the engine and remove ignition key when 

working under or around the vehicle.  When 

working in the engine compartment, the engine 

should be shut off and the ignition key should be 

removed.  Where circumstances require that the 

engine be in operation, EXTREME CAUTION 

should be used to prevent personal injury resulting 

from contact with moving, rotating, leaking, heated 

or electrically charged components.

3. 

Do not attempt to install, remove, disassemble 

or assemble a component until you have read 

and thoroughly understand the recommended 

procedures.  Use only the proper tools and observe 

all precautions pertaining to use of those tools.

4. 

If the work is being performed on the vehicle’s 

air brake system, or any auxiliary pressurized air 

systems, make certain to drain the air pressure 

from all reservoirs before beginning ANY work 

on the vehicle.  If the vehicle is equipped with 

a Bendix

® 

AD-IS

®

 air dryer system or a dryer 

reservoir module, be sure to drain the purge 

reservoir.

5. 

Following the vehicle manufacturer’s recommended 

procedures, deactivate the electrical system in a 

manner that safely removes all electrical power 

from the vehicle.

6. 

Never exceed manufacturer’s recommended 

pressures.

7. 

Never connect or disconnect a hose or line 

containing pressure; it may whip.  Never remove 

a component or plug unless you are certain all 

system pressure has been depleted.

8. 

Use only genuine Bendix

®

 brand replacement 

parts, components and kits.  Replacement 

hardware, tubing, hose, fittings, etc. must be of 

equivalent size, type and strength as original 

equipment and be designed specifically for such 

applications and systems.

9. 

Components with stripped threads or damaged 

parts should be replaced rather than repaired.  Do 

not attempt repairs requiring machining or welding 

unless  specifically  stated  and  approved  by  the 

vehicle and component manufacturer.

10.  Prior to returning the vehicle to service, make 

certain all components and systems are restored 

to their proper operating condition.

11.  For vehicles with Automatic Traction Control (ATC), 

the ATC function must be disabled (ATC indicator 

lamp should be ON) prior to performing any vehicle 

maintenance where one or more wheels on a drive 

axle are lifted off the ground and moving.