+1 - I seem to get this a lot atm. Also does it happen after you wash the car? This is the same thing if the pads rust to the disc slightly
Always run the car up and down the drive with the brakes on to get rid of some of the excess water after washing it before putting the car back to bed in the garage with tha handbrake off and in gear
scrap I'm afraid. There is one company who does a conversion kit, but they basically rip it out and install a new one but leave the screen. Very expensive too