trailer brakes locking up/ hopping

Definitely make sure that your shocks are good.

I have heard that if the ride height is too high it can make your brakes lock up empty or hop.

I would think that makes sense because if your ride height is too high your airbags are going to be stiff and your tires will have a tendency to hop.

Even if you set it a little lower than what they say it should be I would experiment with that and see if it helps.

 

Buddy did u find out what was problem?? Am having same problem with 2014 utility dry van

 

No man today i have changed abs valve both brake chambers no thing aolved

 

Proportionvalve, it’s an issue with our trailers here.

 

I have a 2018 Dane reefer. Took it to great dane, they did internal repairs and drum and shoe replacement. Meritor shoes and gunnite drums. My trailer brakes now pulse badly. They lock up easily. I took it back on Monday and they went thru it again to no avail. They supposedly jacked it up and spun tested things with brakes backed off ever so slightly to look for an out of round drum. Results negative.

What am I missing here. Old set of brakes didn't do this at all

 

Does it have abs on both axles?

 

I m having same issues on my wabash trl if any one can help

 

Oil contaminated shoes can do this. also an out of round drum

 

You could try replacing the foot-pedal valve on your truck, it's cheap and it helped me in this situation

 

I have a 1976 trailer that was sensitive with old brakes, and also brand new. I use a 2013 Paccar DAF/Kenworth truck to pull it. I don't now the name of the bit, but the tug has an adjustable electronic device that applies brake pressure to the trailer. It was OK when loaded but very sensitive empty. The mechanic connected a lap top and dialled it back to its lowest setting. Its a lot better now especially in the wet empty.