That is more or less the "Mopar" master cylinder used by just about everyone. Did you pop it apart and see if one of the lip seals may have been put on a piston backwards? It's possible they made a run of hundreds of them with the same defect. If you take the snap ring off and pull it apart, take a look at the seals. At the closed end of the cylinder there should be a piston with 1 seal, the lip toward the closed end. That makes one closed chamber. The second and third lip seals face each other, creating a second sealed chamber when you push them forward. Make sure the 4 little drillings are open from the reservoir into these two chambers when the cylinder is at rest. That's how they refill when you release the brake and vent as the fluid temperature increases. There is nothing else really inside those simple cylinders. I would recommend buying only a new master cylinder for a race car. Not sure if you are buying re-manufactured ones or not. Good luck with it.
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