Bleeding brakes - ABS 126

I replaced the front calipers and hoses tonight on my 300SDL. I did one caliper, and without bleeding it I had to drive the car in order to turn it around to get to the other wheel (working on the street). While doing this, I obviously had to hit the brakes. I proceeded to replace the other caliper, then bleed the front two calipers until there was a steady trickle of fluid with no air bubbles. The brakes feel great, but do I need to bleed the back calipers too? Did I get air in the whole system or just the front brakes?