David, the master cylinder was installed in the early 90s that I bought from my friend who owned Wally’s Auto who used to restore Panteras. My OEM master cylinder was going bad so he installed the one that I currently still have on the car. I don’t know the bore sizes. I thought that my friend who installed the brakes said that it had a 1” bore. He removed the factory proportioning valve. It still has the pb booster. From the limited amount of driving I have done over the last few months, I feel the pedal feel and effort is appropriate.
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