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swapping brakes on trailer #13581552 06/03/20 10:11 PM
Joined: Sep 2008
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hopalong Offline OP
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anyone ever change from drum to disc on your boat trailer?

thinking of doing my champion.


" Hop, set the hook"!

TexDawg 99,999

lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
Re: swapping brakes on trailer [Re: hopalong] #13581704 06/04/20 12:08 AM
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bronco71 Online Content
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Drum to disc conversion
not difficult but several things to consider when choosing the parts/kit....


1999 Triton TX21/225 Mercury Optimax
Re: swapping brakes on trailer [Re: hopalong] #13582231 06/04/20 11:53 AM
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T Bird Offline
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I did my Champion/Easy Loader trailer, not difficult.


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USAF "Thunderbirds" Alumni 1985-1989

Okie by birth, Texan by choice.
Re: swapping brakes on trailer [Re: hopalong] #13582325 06/04/20 12:51 PM
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Flippin-Out Online Content
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Master cylinders (the surge unit in the trailer tongue) are specific parts for drum vs. disc brakes, or at least UFP brand ones were. The unit for drum brakes has a "preload pressuure" valve that always holds a certain amount of pressure on the drums - probably because they have to travel so much to engage. That is done with a spring-loaded check-valve type setup. When I did a conversion kit on an older trailer, the instructions included a step to disable that check-valve to avoid constant disc brake engagement. Be aware of this if you convert a drum system to disc.

I seem to recall the check valve was in the master cylinder body at the output port. All I had to do was puncture the metal seal of the valve with a small center-punch. I could see this when I removed the brake line from the back of the master cylinder. It was a simple 5 minute step in the conversion, but an important one. Hopefully you are adding a reverse solenoid valve also? You'll need to move up to a 5 wire flat trailer connector as the most common way to connect that - unless you like the full 7-round.

Of what I know of you, this is NOT a difficult job. You'll love the disc system. Mine was well worth it.

Last edited by Flippin-Out; 06/04/20 12:53 PM.
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