Recently replaced the pads on my front brakes to try and eliminate a VERY loud shriek. I've tried every possible configuration of toe, height on the rim, distance to rim, and I've cleaned the rim with 240 sandpaper, but to no avail. However, I noticed a weird effect - the brake does NOT scream when the front wheel turns in REVERSE. This makes me think the problem lies outside the pad/rim interface: could it be play in the attachments from the calipers to the fork, for example? I've shot some WD40 in there, but still nothing.

Many thanks for all replies - I can provide some pics if they would help.

M.