I have changed the rear drums,shoes,springs, and anything else i could think to do, but still to this day it squeals every time i touch the brake. In the snow is the worst the rear wheels will lock up and slide everywhere. I have talked to two different mechanics and the best explanation i have got was that ford has a to much fluid going to the rear drum and that the dust is building up in the drum and making it squeal??????????????? I don't know what to do any Help would be great.