The NHVR’s National Heavy Vehicle Inspection Manual (NHVIM) has been enhanced since the first edition of this TAP was published in September 2016. As a result, this TAP has moved towards awareness and checking the adjustment of the slack adjuster. The mandating automatic slack adjusters has meant slack adjusters too often have their routine visual inspection skipped. However, their mechanisms can become jammed with road debris or from component strike events and may not perform their intended function. This TAP provides some supplier links for service, general maintenance and correct setup guidance.