How do you adjust trailer slack adjusters?
Moreover, should you adjust automatic slack adjusters?
Automatic slack adjusters are able to maintain brake stroke more reliably than manual slack adjusters. But, automatic slack adjusters must still be checked as part of a pre-trip inspection. Once properly installed, automatic slack adjusters shouldn't need manual adjustment.
- Less than four psi in one minute for single vehicles and less than eight psi in one minute for combination vehicles.
- Less than two psi in one minute for single vehicles and less than three psi in one minute for combination vehicles.
- Less than six psi for all vehicles.
Accordingly, how do self adjusting slack adjusters work?
Automatic or self-adjusting slack adjusters. Automatic slack adjusters are designed to continuously and automatically maintain the brakes in proper adjustment during normal use. If they are badly out of adjustment it may take up to 12 brake applications of 100 psi (690 kPa) to adjust them.
Slack adjusters (also called brake adjusters or just "slacks") regulate the distance that the air brake has to travel to apply friction to the wheel. This distance increases as use of the brake causes the friction material of the brake shoe to wear away.