How often should slack adjusters and brake adjustment generally be checked on a vehicle in regular service?

Correct answer to question 28 (Air Brakes): As part of regular pre-trip and periodic inspections, not just when a problem is suspected

Why

Brakes gradually wear and go out of adjustment over normal use, so checking them as a routine part of pre-trip and periodic inspections catches the problem early, rather than waiting for a failure or a complaint.