Do we know for sure its the fronts binding? My first thought reading the post was hoses to the calipers, but as you say, they're new. So, I'm thinking rear hoses. And yes, flush the system.

__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.