boat trailer problem

Theres a master cylinder with a linkage under the coupler. Make sure that's still connected

It’s common with surge brakes.

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Make sure the surge actuator on the front of the trailer has brake fluid.

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done

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That snatch you feel is the coupler flopping around in the tongue when accelerating or braking.

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This and yes they do break.

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You said the fluid is full. Did you let it go dry?

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no, i topped it off

Some have a shock shock absorber that helps lessen the thud, I had to change mine a few years ago. It helped a lot.

Another thing to check is if there is air in the lines bc that will compress and allow the coupler to move more like a soft brake petal.

One other thing is to make sure the brakes are adjusted properly, it’s another thing that will let the coupler move more than needed.

A sticking wheel cylinder or caliper are famous for the jerk when taking off.

Master cylinder may need to be replaced.

If you have a sloppy receiver it will amplify it a lot, the best thing I did was buy one of those u bolt and plate thing that stop the rattle when not towing. It actually helped when towing.

You can also try stopping less aggressively and letting off the brakes and rolling a little before laying on the gas to let the trailer brakes release and the slack be take up on the coupler.

There will always be some clunk, it’s just the nature of surge brakes.

thanks but the breaking cylinders are doing NOTHING. i had ms mack (no pics) move the boat up and down the driveway while i sat in my truck bed and watched what was happening. there is NO resistance in the trailer tongue.

solutions - in order?

fyi: didnt need to add much, just a lite topping off

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Something leaked somewhere which means air probably got in.

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no fluid on ground under the tires, so....