Thanks for the pics of the "guts". Is that all that was in there? No secondary piston? I see they used a double lip seal in one location. That's a little money saving idea and you can't put it on backwards with two lips on it. Easier for the 4 year old Chinese kid to assemble. Do the seals seem to have some friction in the bore? Just wondering if the wrong size seals for the bore were used. As far as a good brand, hard to say other than just trying various different ones until you get one that works. I use nearly all NAPA parts unless buying direct from a race vendor. Can't honestly say I have never received a defective MC from NAPA. Needed two try's to get a working one on a Sprinter Van a year or so ago.
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