Hey girth just a heads up, the slack adjusters have absolutely nothing to do with how fast the air builds. That operates solely from the compressors ability to build air. That slacks adjustment are for how far the brake linings are set from the drum and there are a few types of slack adjusters, they push an arm that is an s cam type or wedge that push the brake linings against the drum to create the friction needed to stop your rig. Hope this helps you understand your air brakes a little better. Good luck and thanks for your input!!
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