mine will squeel around the brake peddle every now and then too.. one day when I had to stop hard, it did that squeel and didn't lock the tires up.. almost rear ended someone because of it. They normally work ok though, let us know if you find out what the cause is <img src="/forums/images/graemlins/cheers.gif" alt="" />

89 Toyota pickup, 4x4, 5spd, 3.0V6
31x10.5 bfg's on 15x8 pacer rims
custom exhaust, k&n air filter