Abs Brake Question...

I had asked this question on the mountaineer forum...Rod was nice a nuff to get back to me with waht he knew...so i thought i'd come here...i just did ASK a FORD mechanic...and got nothing for the cash i laid out..NO REPLY,.here is the problem...has gotten a little worse since i posted it....when i'm on icy roads or snow covered roads as we have had and i hit the BRAKES.as long as my foot is on the BRAKES i have a squeel from under the dash...like from some type of buzzer???????????? when i let off it stops...when i hit the BRAKES and the ABS is activated..i get the squeel....but not on dry paynment or rain wet roads...only on slippery raods and ABS is then activated.....


any clues....thanks...

wayne