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mack the knife
LSU Fan
EBR
Member since Oct 2012
3963 posts

boat trailer problem
boat trailer has breaks. when stopping/starting i get a BIG clunk/yank/bang on my truck. trailers rides great on interstate/hwy, fyi. break fluid reservoir is full. i’d like to attach pics but i’m technology challenged. this just started yesterday, help pls.


DownshiftAndFloorIt
LSU Fan
Here
Member since Jan 2011
54648 posts

re: boat trailer problem
Theres a master cylinder with a linkage under the coupler. Make sure that's still connected


mack the knife
LSU Fan
EBR
Member since Oct 2012
3963 posts

re: boat trailer problem
thanks, i’m gona try that


NewIberiaHaircut
LSU Fan
Lafayette
Member since May 2013
9665 posts

re: boat trailer problem
It’s common with surge brakes.


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EveryoneGetsATrophy
LSU Fan
Member since Nov 2017
1710 posts

re: boat trailer problem
Make sure the surge actuator on the front of the trailer has brake fluid.


mack the knife
LSU Fan
EBR
Member since Oct 2012
3963 posts

re: boat trailer problem
quote:


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


done


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DownshiftAndFloorIt
LSU Fan
Here
Member since Jan 2011
54648 posts

re: boat trailer problem
It's an extremely simple system. Theres a cylinder with the coupler being what pushes the cylinder in to apply pressure to the brake shoes. That snatch you feel is the coupler flopping around in the tongue when accelerating or braking.


fishfighter
LSU Fan
Baton Rouge
Member since Apr 2008
37827 posts

re: boat trailer problem
quote:

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


This and yes they do break.


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hophead
LSU Fan
Georgia
Member since Nov 2007
1353 posts

re: boat trailer problem
You said the fluid is full. Did you let it go dry? Good chance you just need fluid and to bleed the brakes. If that's not it, you have the actuator in the front and of course the brakes. If you're not able to change them yourself, it'll be costly (sorry to say)


mack the knife
LSU Fan
EBR
Member since Oct 2012
3963 posts

re: boat trailer problem
quote:

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

no, i topped it off


td1
Baton Rouge
Member since Oct 2015
1008 posts

re: boat trailer problem
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.


back9Tiger
LSU Fan
Mandeville, LA.
Member since Nov 2005
8316 posts

re: boat trailer problem
I've had mine do that off and on. Sometimes the actuator is stuck.


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mack the knife
LSU Fan
EBR
Member since Oct 2012
3963 posts

re: boat trailer problem
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.


td1
Baton Rouge
Member since Oct 2015
1008 posts

re: boat trailer problem
Blown master cylinder or broken actuator rod, or your lines are full of air.



mack the knife
LSU Fan
EBR
Member since Oct 2012
3963 posts

re: boat trailer problem
solutions - in order?


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DownshiftAndFloorIt
LSU Fan
Here
Member since Jan 2011
54648 posts

re: boat trailer problem
quote:

Blown master cylinder or broken actuator rod, or your lines are full of air.



Cant be much else. I suspect air since you needed to add fluid to it


mack the knife
LSU Fan
EBR
Member since Oct 2012
3963 posts

re: boat trailer problem
fyi: didnt need to add much, just a lite topping off


DownshiftAndFloorIt
LSU Fan
Here
Member since Jan 2011
54648 posts

re: boat trailer problem
Well theres only two moving parts in this whole system: the master cylinder and the calipers or drum slave cylinders. If everything up front looks ok and seems to work like it should you'll have to go into the back. Something leaked somewhere which means air probably got in.


mack the knife
LSU Fan
EBR
Member since Oct 2012
3963 posts

re: boat trailer problem
quote:

Something leaked somewhere which means air probably got in.

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


td1
Baton Rouge
Member since Oct 2015
1008 posts

re: boat trailer problem
The don’t hold much fluid. It could have been low enough to let air in.

If it is a wheel cylinder it could have been leaking a very small amount for a while that might not show on the ground.

You might want to pull the hub/drums on the axle w/ the brakes and check the cylinders.

Champion trailer in Slidell is where I got mine from. Decent prices at the time. I ordered two loaded backing plates.

LINK


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