Strange trailer bouncing with my 99 250

[Rio_Grande]

I have a 99 F250 crew cab short bed. I pull several gooseneck trailers with marginal brakes. I have one new trailer with of course new brakes. It is a gooseneck and I pull it with a 10500 lb skid steer on it and a implement or two. When I adjust up the brakes to the proper amount and when i apply them I get a strong forward and back surging bounce to the rig. I have pulled this trailer with other trucks and not had this issue. The only issue i know I have is the shocks are about due on this truck.

What would cause this?

I have a second trailer that I reworked the brakes on and it has almost none when adjusted to max. I adjusted the shoes to the drumms and get a bit of braking but I also notice a lot of interfearance in the radio when i apply them.

Thanks for the input.

[Rio_Grande]

Nobody??????

[jesilvas]

Sounds like the brake controller to me.

[atvrider93]

shocks are also a pretty good idea when pulling 10k+ lbs

[StarDriver]

You've got an electrical gremlin that is causing this, shocks won't make it bounce when just applying the brakes. When you step on the brakes and get radio interference, that is an electrical problem.

[atvrider93]

Definitely not saying shocks are THE problem but worn ones can exacerbate it. Its weird that you get radio interference though. where are the power wires for the brake controller tapped into?

[Gene]

How many axles on the new trailer have brakes? Does your brake controller support it? Some brake controllers only support a single brake axle.

How is the trailer grounding? Do you have a bad ground on either the trailer or the truck? Does the new trailer have a rubber-mounted gooseneck hitch? If so, the ball hitch might not be able to work as a ground, and could cause some interference.

Just some thoughts. Good luck tracking it down.

[merc123]

Usually interferance in a radio is a bad ground. Make sure your brake controller is grounded correctly.