Right front brake caliper dragging

Are you saying the only way to bleed the brake pressure modulator is by manipulating the brake control module to open the three outlet lines on the BPM (one rear, one left front and one right front) by using a high end data scanner to send voltages to open those lines in order to bleed? Or can it be done manually? Or can it be bled with a scanner that just reads codes? Just to be sure we understand each other, the calipers were replaced, front brakes bled and then this symptom started, so how did the air travel into a closed valve if the car's entire abs system was off (no voltage) while bleeding the air out of the calipers and maybe some residual air in the line between the caliper and the brake pressure modulator (Chevrolet's terminology for the ECU and proportioning valve two pack that makes up the ABS central hub unit electrical and hydraulic).

As suggested, I took it to local Chevy Dealer (only shop that had the scanner needed locally) and they did an active ABS bleed and complete system flush for $50. Not too bad. 1 service manager out of 5 local shops worth of Techs had ever come across this before, myself included. I am ASE certified in brakes (and 4 others areas) since 83 and I have never had backward airflow into the ABS setup from changing out a stuck caliper or even seen the scenario on an ASE test. I even went to Chevy dealer and asked if that exact scenario was possible right before I talked to you. Their reply - probably an internally collapsed flexible brake line! But after you shared this with me and I talked to almost every Tech around here, only ONE person, an ex- Chevy service manager - now at a Chrysler dealership - was familiar with and recommended the same procedure. Closest large town dealer wouldn't even offer advice - "$99 and we will troubleshoot." This problem is not as common a problem as you might think - at least not around here. But when I went back and asked local Chevy dealership if they had the right scanner and the capability - the service manager's superior looked it up on the shop's computer, quoted the price and followed through. Simple procedure IF you have the right scanner. Brakes work great now. Pedal travel still seems long and spongy to me just idling, but when driving the brakes work great with very little effort or travel. Chevy says that long travel is normal on that model. Anyways, Seems to have cleared up the issue. Many thanks - hope you are happy with my humble appreciation and a chicken dinner as this was a favor to an elderly neighbor. Dave P. - Florida

I have had cars do the same thing. If the system is open at air gets in. When you push the brake pedal to bleed the air moves and compresses. That is why we bleed all four wheels when only one caliper has been done. The same goes for the abs module.