Expert: Skip Bollinger - 8/9/2006

Question
I have a 2000 XLT Ford Expedition and the abs light comes on and stays on. When I first start the engine it, goes through its computer check and I hear a slight thunk or engagement attempt in the abs system but it must not engage or check clearly bc the light comes on immediatly after this and then it stays on. Are there any sensors that can cause this or is it a major malfunction that is causing it to trigger the warning light? Any info would greatly be appreciated. Thanks!!


Answer
Chris,
  I'm so sorry to take so long to respond. My kids are home from college and THEIR car broke down last night. That had to take priority and I'm sorry.
  To your question... I'm a PARTS professiona. NOT a tech. I will do my best to help you but I think I'm going out on a limb. I'm just trying to be honest with you....
  The ABS system, to my knowledge, should make NO noise. It is hydroelectrical computer driven. Can you tell where the "slight thunk" is coming from?? The ABS system does not engage until you press the brake pedal in a "panic stop". I think you need to find out where the noise is coming from and look into that.
  Have you taken the truck out for a drive and tried a "panic stop" to see if the ABS is working?? You might try this at a deserted parking lot such as a school. Just be careful because IF the ABS doesn't work, the back end of the truck could come around on you.
  I'm sorry I haven't given you very much useful information. Like I said, I'm a parts professional, not a tech. You might try asking someone else in this venue. Thank you for asking, however.

         Skip