Swapped out my crappy second hand front calipers for my rebuilt ones today, all went good with the fronts, bled fine, has plenty of stopping power through fronts etc..
But!
My braking bias is now 92% front and 8% rear after bleeding all four. They were definitely bled properly and I bled them twice, still can't get any pedal feel or braking to the rear. I'm thinking I may have fucked a seal when I bled them but am unsure. Handbrake is working fine.
Had to engine brake and handbrake the whole way home

Any ideas? I was just going to chuck a rebuilt kit through the rear but if anyone else has ideas...