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Automatic slack adjusters are designed to continuously and automatically maintain the brakes in proper adjustment during normal use. correctly loose jam nut, automatic pawl before proceeding down the asa forward chamber units with manual slack adjuster vs automatic slack adjuster. I'm not a fan of the auto adjusters myself FWIW. Manual adjust forces you under the truck to inspect occasionally. On a 5000 mile a year truck,Automatic slack adjusters do a great job of keeping stroke within limits overall, but a lot are found to be out of adjustment during roadside brake inspections.