I have had a persistent brake squeel coming from one wheel which I cannot pinpoint and its driving me nuts. Last week I stripped and refitted the front pads which I replaced 6 months ago - discs are fine etc. This weekend I replaced the rear pads which were wearing thin, and yet I'm still getting the squeel. I'm thinking maybe there's a metal bit accidently cast into the asbestos of one of the pads. Any thoughts welcome.