to control the position of the implement left or right and to stabilise it stop it from swaying from side to side
No. You'll have two slack adjusters per axle, assuming it's using s-cam foundation brakes all around - disc brakes don't have slack adjusters.
Where I live if the truck was manufactured with automatic slack adjusters you can NOT replace them with manual ones. Check with your local DOT you never know.
Two per axle.
Yes there are slack adjusters on railroad cars. They work much like the automatic slack adjusters on large trucks, and do the same job
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The difference between manual and automatic slack adjusters is the way in which the brakes are adjusted. Automatic slack adjusters have sensors that do not let the brakes get too loose or too tight. Manual slack adjusters have to be adjusted by hand and can be set too tight in some cases.
half inch or less
Looking through FMCSR 393.47, the only requirement I see in there is that the effective length of a slack adjuster on each end of an axle must be the same.
You don't. They adjust automatically.
Step on the brake pedal.
Volvos have automatic slack adjusters, which are dangerous to manually adjust. If your brakes are so far out of whack you think you might have to screw with the slack adjusters, you really need a brake job. Usually the slack adjuster must be backed off before you can remount the brake drums. The do have to be adjusted manually to get at least some drag on the drums before you set them automatically.
Slack adjusters are the linkage between the pushrod in the brake chamber and the S-cam between the brake shoes.