Bendix Trailer ABS system, how to troulbeshoot it?

post me ABS unit part # and I'll tell u how to.

The first step is to identify system

 

One way is to simply have someone be in the cab and you be in the back next to the service valve with the ABS "brain" on top. you should hear a click when they turn on the key and i was told to do this years ago from a Wabash tech and it is the only easy way without a diagnostic program such as Jaltest.

If it still is working you could have a block in one of the service lines going to the air chambers and weeding out issues from here can be quite involved capping on each line and seeing if air is back feeding from the chamber, so this process can become quite involved and should really be done by someone that has dealt with the issues before and is familiar with air systems.

 

Turn key on within 10 seconds of power up pump brakes 3 time abs light will then give you a flash code