Dash lights are on, yellow triangle and red abs and brake light. Symptoms are: After stopping, when letting up on the brake pedal to go, the brakes stay on and are locked until the accelerater is depressed. A grinding noise is heard as x5 tries to go and the brakes are still locked on. Finally, the brakes break loose and the X drives normally. I reset the lights by turning steering wheel back and forth but as soon as the brakes lock up again the lights come back on and I lose ABS control. I know the ABS is not working because I slammed on the brakes at 50 mph the brakes locked up the wheels and I left black skid marks on the street where I had stopped.

After searching the archives I know that the abs wheel sensors can go bad. Right rear senser if dash lights are on and cruise control isn't workng. Left rear sensor if dash lights are on and Speedo isn't working. Both my cruise and speedo are working just fine. What symptoms do the front sensors give when they are failing? I am prepared to send the ABS module in to Module Masters but I just want to make sure that it's not one of the front sensors going bad. Any help here is appreciated.

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01' x5 sport w/ 58k miles
97' 528i w/ 101k miles
94' 325i vert w/ 75k miles
All white with beige int.