Posted by Fred Werring on May 28, 2019 at 06:59:09 from (162.213.228.87):
Ford 8700 dual master cylinder, pistons won't return all the way to allow brakes to release.
This is a new last year MC I bought last year. Ok, it was for a mid 60's Chevy truck I bought for $40 off of Amazon, New Holland wanted $700 for a MC. Had tried rebuilding my original, but too much rust pitting in the bores.
Anyway, when I was bench bleeding the new one it seemed to hang up about 3/8" from full return. Worked it some, and problem went away. Used it last summer with no problems.
Get the tractor out to bale hay this year, right piston is hanging up again, wont allow brake to release.
So my question...do I remove the spring, stretch it out and re-install it? Will it stay stronger? Or do I buy different stouter springs and install them?
The spring that's in there is 3.5" long, 3/4" diameter, 0.060 wire diameter. Can get springs with the same dimensions except 0.080 wire, may have to cut a couple coils so it will depress all the way.
What would you do?
As a side note...when I tried rebuilding the original MC, it was hanging up also. I blamed it on the bores, but I'm thinking now it may be the pistons they use now ...Orings on the pushrod side of the piston vs a cup on the original MC.
Pics are of the MC I bought, and of a rebuild kit for that MC
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