1984 Porche 944 brake pedal sticks down?

Whena car is NEW,the brake fluid is CLEAR to LIGHT PEE YELLOW! AAS IT ages< IT COLLECTS OXYGEN FROMT EH AIR AND EVENTUALLY TURNS INTO acidic liquid sandpaper! if YOUR brake fluid IS DARK BROWWN, IT HAS DONE IT'S JOB AND now IS A dead fluid AND MUST BE pressure changed WIH EQUIPEMNT WITH newer synthetic BRAKE FLUID! tHE old FLUID WOULD COLLECT MOISTURE FROM THE AIR, LIKE IT IS supposed TO DO, AND THEN THE BOILING POINT WOUDL BEGE=IN TO drop! smart people WILL CHANGE AND FLUSH TEH brake fluid EVERY 2-3 YEARS TO prevent CALIPER AND MASTER CYLINDER FAILURES AND TO KEEP THE brake lines IN SHOWROOM CONDITION WITH no CORROSION INSIDE THEM! 

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Then go to the dealer and get the brakes repaired.

Don't let some hack at Firestone do the work

i would get a mechanic to check it out

maybe you should get a mechanic to check it out

Check for a broken return spring.