Right Front Brake 'Dragging'

311boom

For the last several months, I have had increasingly frequent occurrences of the right front brake 'dragging'. I have no warning lights in the car. I have taken the car to two shops and a Mazda dealer and none have been able to diagnose the problem. I know it isn't a sticking caliper because if I open the bleeder valve on the right front wheel, the pressure is relieved and the wheel spins freely. There seems to be hydraulic pressure being held on that wheel only. If I jack the car up, the right front wheel cannot be rotated freely while the other wheels can.

I am hoping someone can help diagnose the proble. Here is what I have done to the car at various points:

• Replaced the caliper, brake line, rotor, pads
  
• Flushed the braking system
  
• disconnected the right front brake line from the ABS control module and blew out the line with compressed air from both directions (in case there was an obstruction in the steel brake line)
  
• Removed both ABS fuses (the 'ABS' and the 'ABS Solenoid')- as expected, this caused the 'ABS', 'TCS' and 'Brake' light to come on. I was hoping that if it was an electrical problem, that removing power to the ABS system would alleviate the symptoms, but it didn't.
  

Any thoughts on the cause for this problem or the next steps I should take?

Appreciate the help!

joejoeson

Does this vehicle have a brake proportioning valve? It sounds like too much pressure is being given to the front brakes, especially if the problem persists even after changing the pads and rotor.