[Steelspine]

Here's the deal. 1974 911 with (dual?) master cylinder. Press brake pedal and it goes to the floor and does not return. No visible leaks in the brake lines (fairly new by eyeballing them) plenty of fluid in the resevoir. Hayne's says master cylinder seal failure. My question is, if the master cylinder seals fail would I see leakage out of the master cylinder into the front axle pan? Does the fluid stay in the system when the seals fail with no discernable leakage at the master cylinder? I know these are pretty basic questions but please bear with me.

Thanks,

Pete