BENDIX BW7499 Manual De Usuario

®

The Bendix

®

 Versajust

™

 automatic slack adjuster is 

designed for use on cam-actuated drum brakes, the 

type in use on most highway vehicles.  Like a manual 

slack adjuster, the Versajust

™

 slack adjuster multiplies 

and transforms the linear force of the air actuator into 

a rotational force, or torque, which is used to apply the 

foundation brake.  In addition, the Versajust slack adjuster 

automatically adjusts the clearance between the brake 

lining and drum to compensate for wear.

A variety of Bendix Versajust slack adjuster configurations 

are offered, including both straight arm and 

5

/

8

" yoke offset 

models.  The Versajust slack adjuster is offered in arm 

lengths of 5, 5

1

/

2

 and 6 inches, and worm gear splines to 

accommodate the standard 1

1

/

4

" and 1

1

/

2

"  SAE 10C-, 24-, 

and 28-tooth splines.

Either of two yoke designs (easy-on and quick connect) in 

combination with an external manual adjuster hex provides 

for convenient installation and maintenance of the Bendix 

Versajust slack adjuster.  

The automatic adjustment provided by the Bendix Versajust 

slack adjuster results in consistent brake-lining-to-drum-

clearance and brake actuator stroke.  The key to its 

operation is the ability to complete the brake adjustment 

during the early part of each brake application and to cease 

adjusting as resistance to brake cam rotation begins to 

build.  This aspect of the adjuster mechanism’s operation 

prevents over-adjustment caused by lining compression, 

actuator  bracket  deflection,  drum  and  foundation  brake 

component distortion, or brake component wear.

The Versajust slack adjuster incorporates a clutch-type  

adjuster mechanism that continuously adjusts – in very 

small increments – as lining and drum wear occurs.  The 

adjustments made by the Versajust slack adjuster are, 

therefore, not in specific increments relative to actuator 

stroke.

Note that the Versajust automatic slack adjuster is 

compatible with Bendix

®

 ASA-5

®

 automatic slack adjusters.  

Therefore, it is acceptable to have a Versajust automatic 

slack adjuster on one side of the axle and an ASA-5

 

automatic slack adjuster on the other side of the same axle.  

When the brakes are applied, the linear travel of the brake 

actuator’s push rod causes the Versajust slack adjuster to 

rotate the foundation brake camshaft, which in turn begins 

to force the brake shoes into contact with the drum.  When 

the Versajust slack adjuster rotates, the yoke assembly 

pivots on the yoke pin, causing the link to be pulled upward.
The “teeth” on the link mesh with the adjuster mechanism 

pinion.  As the link is pulled, it travels first through its free 

play and then causes the pinion to rotate.  Rotation of the 

pinion is transmitted through the clutch spring to the worm 

MANUAL 

ADJUSTMENT 

HEX

BOOT

LINK

LINK 

PIN

YOKE 

PIN

YOKE

WORM

GEAR

Compatible with 

Bendix

®

 ASA-5

®

 

Automatic Slack 

Adjusters

LUBE FITTING