SSBC disc brakes won't stop

Thanks. I'm going to try your suggestions today. Thinking air in the MC. Or contaminated surfaces. The fluid did not drain from the mc when doing the rear brake change. Did not clean the new rear surfaces with cleaner. Could be contaminated and affecting the grab. The front brakes have been on the car for a while and should not need cleaning but the rotors had rust film on them from sitting for about a year. Driving it took the rust off. All bleeders are pointing up. Had the added prop valve closed completely.