IH trucks particularly the extreme heavy duty Paystar line may be kind of odd balls. If it is like most of the truck with air brakes of that era the part you are looking to do the adjusting on is called the ..slack adjuster.. In the link the 3rd diagram down the example to the right ..type II.. is the most common type I came across working on a few hand fills of heavy duty trucks in the 80s and 90s. The slack adjuster is where you adjust the brakes. I believe the adjuster hex size was 9/16 inch wrench. Around the hex is a locking collar you push in and then turn the adjuster hex to tighten or loosen the brakes. I believe it follows regular bolt thread left loose and right tight. I suggest you first try adjusting one that already is released to get the feel of how they work. If the adjuster has pressure on it they can be difficult to turn.
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