If the pedal dropped to the floor - it went the whole length of the stroke - but you still have the correct fluid level =>

I'd suspect the master cylinder

However you should check all parts of a braking system - especially the flexible hoses.

If you have leaks / low brake fluid level then you've got more investigative work to do.



I hope you checked the fluid level before driving off again.

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!