brakes not working properly on 1999 Porsche 911

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When I push on the brake pedal it seems to lock up??? If I hit them hard they don't stick but if I just push down they slam you to the dash. Checked the lines and has good vacuum. any ideas??
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suspect there is either a caliper or master cylinder issue. when was the last brake fluid flush done? (every
2 years with super DOT4 fluid only)
ended up changing the master cylinder and booster. Any idea why the booster would have water in it????