Re: need a new master cylindercoupler
You don't have to get the entire coupler, you can disassemble it and just replace the master cylinder, they are only 89.95 at Easternmarine.com that's what I did. It's pretty easy. And the 10 or 20 use the same master cylinder, so you don't need to figure out which one you have. Look under online superstore then "hydraulic trailer brake parts" the correct one is about 3/4 down the page part #5237005.
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Stan