surge brake problem

[wagonmaster]

When applying the brakes when towing my boat, there is a violent thump and noise. This has been going on for some time now and it doesn't do it all the time. Often it will happen when I take the boat out of the water, thump 8 or 10 times and then quit. I had SG replace the bearings, so no issue there. I don't think the brakes or tires are seizing up as far as I can tell. Wondering if the actuator is slamming forward on these occasions. Any ideas anyone? Can anyone suggest a good place to go and have this looked at? SG has had a couple of looks at it and hasn't come up with a solution other than to redo the brakes and bearings which has been done. Thanks.

 

[fish brain]

How is your tongue weight? Your boat too far back can cause things to bang around a bit especially going up hill such as at the ramp. Or the actuator, but you'd think SG would have caught that.

 

[Scavenger]

Check your tow vehicle for loose bolts receiver and ball.

 

[AlK]

I would suggest that the surge brake shock needs to be replaced.

 

[gunnerlove]

I would rebleed the brakes as a start.

 

[bones]

I'd start with air in the line allowing the surge to compress. Try filling the resi and bleeding them. I just finished replacing a dry line that had no fluid in it.

 

[Seaspanker]

i might be off the mark for a possible remedy for you but have you tried a hitch clamp , it will totally remove any slack inside between the hitch and the receiver which would thump naturally up and down a bit , google it up and maybe for $25 it ? well it wouldn't hurt the situation . Google it up and see just what it does, might have a well worn hitch ?