I need new master and slave cylinders to finish my conversion. Found what appear to be Japan oem type parts (master $62, slave $32). I also found some, what I call aftermarkets at $38 and $20 respectively. Not trying to be too cheap, but any advice on how well the aftermarkets perform and set up? Thanks

If they are Japanese,usually the reservoirs will have a blueish tint to them. Should be good to use,as for the slave cylinder and as for the master,you want only new and not rebuilt. Same goes for the brake master and wheel cylinders. I would stay away from any parts from China.

Sounds to me like you're simply deciding on which aftermarket part to buy.

There is OEM, and their is aftermarket.

OEM is Tokiko or Nabco, PERIOD. This is what you would get in a "Nissan" Box if you ordered from a dealer. They are in this instance, no different, other than pricing.

Aftermarket is anything you buy after the sale, technically... So Nissan has aftermarket parts. But generally it means NON-DEALER supply chain supplied parts.

OEM means one thing, the SAME Original Equipment Manufacturer is supplying the parts to individuals and wholesalers, same as they provide to the Manufacturer. Nissan didn't make hydraulics, Tokiko and Nabco did. And Tokiko and Nabco sometimes didn't make the castings, Hitachi did. It all depends on what you want in the part. If you want the same QUALITY as what came on the car back when it was new...Tokiko or Nabco is the only way to get it.

And they can come as any number of brands reboxed: Napa, etc... It's not what's ON the box that defines if it's OEM or not... It's what's IN the box that does!

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People here simply want feel good answers. Don't confuse them with FACTS, Dammit!
Tony D: "Knowledgeable but Caustic"... rationull
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The last few years I've had a lot of problems with the Nabco and Tokico master cylinders of both clutch and brakes. Most of them were NOS and their shelf life had unfortunately hit rock bottom. The seals had gotten hard and quit sealing of course. I was getting about a 20 to 30% failure ratio plus their prices kept going up so I quit using them and went to a different manufacturer. So far zero failure on the clutch masters and about a 1% on the brake masters. Unfortunately they no longer use the metal reservoir caps, they went to plastic.
Z man of Washington

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Were they Nissan NOS ZMOW, or were they old stock? The Nabco and Tokiko stuff I've gotten the past couple of years has all been what looked like fresh stock.

Indeed, like you stated, with the 'plastic caps' as well. I have taken to salvaging the original reservoirs in the junkyard and horfing the caps for retrofit to the new parts I install.

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People here simply want feel good answers. Don't confuse them with FACTS, Dammit!
Tony D: "Knowledgeable but Caustic"... rationull
You simply can't call someone a F**ktard here, no matter how truthful it is.
Stupidity is contagious, and looks like it's pandemic here...

The parts weren't coming from Nissan, they were coming from our aftermarket distributors. They looked ok, although it was obvious that at least some of them had been on the shelf a few years. I got tired of having to ship things back. When I start losing money on parts I have a tendency to not want to buy them anymore for some reason. Go figure
ZMOW

That can be the issue with soem aftermarket suppliers, especially larger suppliers that buy overseas surplus. They can clear out stock from larger whoelsalers as 'slow moving inventory' by the palletload CHEAP.

This is how Porterfield gets their brake shoe cores. I was there when they got a 40 foot container of brake shoes... pallet loads of old stock. BRAND NEW, but obviously stuff that had been there for a while sitting on someone's shelf for years. I saw names on those boxes of parts houses that haven't been in operation for years.

But what goes wrong with brake cores. Guys at Porterfield said "yep, we strip 'em and put our material on them...corse is cores!"

There is a LOT of old stock out there.

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People here simply want feel good answers. Don't confuse them with FACTS, Dammit!
Tony D: "Knowledgeable but Caustic"... rationull
You simply can't call someone a F**ktard here, no matter how truthful it is.
Stupidity is contagious, and looks like it's pandemic here...

Depending on how and where the brake shoes were stored, corrosion between the friction material and the plate, and/or the rivets, is all I can think of, as long as the friction material was not physically damaged by something sharp gouging it. Plus, they can legally say that the shoes have been reworked by them for the warranty. It's probably a legal thing, forcing them to strip off what looks like (and likely is) perfectly good stuff.

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Bob, in San Diego
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Dealer. Dealer. Dealer. They are a little bit more expensive. I went through three master cylinders in 3 years from aftermarket. Same with my clutch master cylinder. I bought dealer oem and they looked fresh and didnt look old. Knock on wood ive been autocrossing for 3 years now, a few track days, and about 10,000 miles and not a single problem since. Maybe I got lucky I dont know, thats just my story.

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71 240z yellow and rusting slowly but with style

Laterzzz