Trailer "jumps/hops/skids" When Braking Empty/Light Load

Make sure the height is set correctly, mine did it real bad, when air bags were over inflated

 

Does it come on at all, it should come on when keys turned on, for a few seconds, if not, it’s not getting power, obviously. I had to replace the short power harness to ecu. ( the one that hangs with the air lines. Once I had power, and abs light was working, I could do a blink code diagnosis.

 

I had to look this up,this zero maintenance damping has me kind of skeptical

 

I've had that problem.

ALWAYS went away when truck gets new drums and shoes.

THere's 10 brakes. They don't function too kindly when half are new drums and the other half are warped drums. The warped drums require a lot more pressure to stop then new drums which don't require much pressure.

The trailer is locking up. While the truck is trying to stop.

 

what do you have for a tractor? are both tractor and trailer drum? Have you tried Swapping Truck/trailer to duplicate it? Did you adjust the brakes and grease the scam/slacks?

 

I would try a different trailer if you could, we had one truck the truck/tractor protection valve went and would basically lock the brakes any time you hit the brake pedal, or something to atleast confirm truck side or trailer side

 

I have the same problem recently. Hoping you get this figured out for both our sake! I was told it’s the control valve but sounds like you already changed that.

For my problem it’s not the tractor brakes either. Doesn’t matter which truck pulls it.