A remote-controlled trailer tester, such as the Alpha Mutt 5700 Series from IPA, can help technicians test pushrod travel and verify proper slack adjuster operation on trailer drum brakes.
To test a slack adjuster, simply back off on the adjustment, and then utilize the remote control to repeatedly apply and release the brakes. With each cycle, the brakes should come closer to the final adjustment. Repeat until the brakes are properly adjusted. If the auto slack adjusters fail to adjust the brakes, this will be revealed quickly.
While conducting these tests, a technician should also observe side-to-side brake timing (balanced brakes). It should never be assumed that full brake engagement happens at the exact same time. Delayed braking from one side can lead to trailer sway, loss of control, and premature wear of brake system components. Delayed-release (stuck) brakes can also lead to trailer fires since engaging the brakes for too long will result in a buildup of heat. All of these problems can be revealed and fixed quickly with the use of a remote-controlled trailer tester.
By using a trailer tester, a technician can work alone without a helper because they can keep an eye on the brake timing while engaging the brakes with the remote control. For further efficiency gains, the use of a tablet at the trailer axle allows the technician to both operate the air brakes and test the ABS system all in one location. The Alpha Mutt tablet, for instance, can access trailer ABS information, read and clear codes, and operate the air brakes and electrical circuits of the trailer.
