Hi guys,
I've got a dual master cylinder that im going to rebuild, it came out of my coupe, been searching around for a kit but they all look like they only come with 1 piston not 2 like in my master cylinder. I also cant find any instructions on how to rebuild it? Would I be better off if I bought a new one?

Thanks

There were two kits for the coupe, for Tokico master or NABCO master.

instructions come with the kit, or Gregory's may explain.

I feel it is better to buy a new one, as I have had poor experiences rebuilding them. But many other guys like rebuilding them.

new one is about $120, not worth rebuilding in my opinion

Over the years, I've attempted to rebuild various m/cyls with zero luck. The problem is a combo of the fact that the bore is often scratched by the debris in there (over the years, the debris builds up to just in front of the pedal/cylinder travel, during normal braking. then when you bleed it, the pedal goes to the floor, and pushes the seals over that ridge/buildup of debris, which stuffs up the seals. But additionally the other thing that seemingly always happened was the cylnder bore itself would see some level of corrosion, and even after honing, it wouldn't produce a surface that would make for good sealing even with brand new seals.

What I would suggest, which i personally favour even more than a new one, is to get a local brake place (and most can do it, or at the very least send it out to be done) - i to have it bored then sleeved with stainless steel inserts.

One of those with new seals will outlast a new one, since the stainless won't deteriorate anywhere near as quick as a cast iron or alloy. Often when the seals in stainless sleeved cylinders go, you can clean out the bores with scotchbrite, fit new seals, and it'll seal like new (the only way generally you'll ever encounter re-builds that work).

Due to size/wall thickness and other peculiarities some master cylinders just can't be sleeved. But if yours can be, I highly recommend it.