Park the car on a dry bit of pavement, refill the MS, pump the brakes a couple of times, then move the car. You could also have a helper push the brake pedal while you look under the car for leaks.

-Jason

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

Tesla Model 3. 136,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.