If the pedal was firm before, you probably still have some air in the system from your repair.

IMO, the only way to do this is with a power bleeder at 15-20 lbs psi. The sequence is RR, LR, RF, LF. You need a clear tube and a good light to see if there are any air bubbles coming out of the caliper fittings. Until you get rid of even the tiniest bubbles, you will have mushy brakes.

This can take a while, and a lot of brake fluid.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe