ABS/Airgbag Computer

Ok the problem starts with, I was having some break issues so I replaced the pads, calipers, and brake hoses. The issue continued so I then replaced the calipers, pads, and rotors. The issues is that the right wheel is locking up. I is over heating and applying to much pressure. This issue gets worse the more I brake and the longer I drive. I had it into a shop they could not find anything wrong. Eventually they replaced the ABS motor and junction block. Things seemed to be fine but then the problem came back. While driving one day the brakes acted up and then the ABS light finally came on and has been on since. Tried to get the ABS code read but every place says their scanner can not connect to the ABS brain and that I need to replace it. So yesterday I replaced the ABS brain. The light has not gone off and I still have the same issue, the right wheel is still acting up. I had it into a local shop yesterday and we did a ohm test on the DTE connector to the ABS connector, which we found the information from his Mitchell source. Everything that we tested points to the ABS brain box being junk, but we just replaced it. While we had the code reader connected we tried to read all the other systems and what do you know the code reader can not connect to the Airbag computer either. The Code reader is a Snap-On, brick. He has used it for years and he is not the only place that has told me they could not connect the the ABS computer. The ABS light is on but the Airbag light is not. The Airbag light comes on when you start the truck but after the self check it goes off.

If anyone has any leads or information I would really appreciate. Other then this issue the truck it great. I would love to keep it but I can not afford to replace brakes every 3k miles or so.

Vehicle Info
1999 Ford Ranger 3.0 V6 Flex Fuel (V)
4X4 with 4WABS

Thanks
Steve

Just on a whim have you checked the flex hose going to the caliper. Flex hoses are noted for failing internally and only allowing the fluid to travel in one direction, to the calipler, not back.
Every time you apply the brakes the fluid pressure builds up keeping pressure on the piston.....Mike