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
1978 black pearl show car-retired, I bought it new
1983 zx turbo daily driver, modified, 3rd owner
1970 240 #23 being restored
1970 240 #638 driver
1973 240 roadster being built
about 70+ other z's & zx's
57 Chev Sedan Delivery
67 Jag E type
2 620 Datsun Trucks
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