This SAE Recommended Practice is intended for testing of manual slack adjusters as they are used in service, emergency, or parking brake systems for vehicles that can be licensed for on-road use. Purpose This document establishes an accelerated laboratory test procedure for manual slack adjusters to determine their integrity and durability in various functional modes and environmental conditions.
Manual brake (slack) adjusters have been replaced by automatic brake adjusters since 1994. They are still used for aftermarket and certain special applications. The test procedure for these adjusters have not changed and are not expected to change due to the newer technology.