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" Q: I have a problem with the ABS in my 1992 Buick Park Avenue. One day as I was driving, the car just started to slow down all by itself. After a lot of looking and trial and error, I unplugged the rear wheel sensor and the problem stopped. My question is, since I unplugged the sensor do I still have all-wheel braking? A: If your ABS (or at least the system on your Buick) packs up, you&amp;#039;ll still have brakes on all four wheels, but without the benefit of the antilock feature. On most vehicles, this is not an issue, but on some -- notably pickup trucks -- this can lead to lack of stability under heavy braking as the rear brakes lock up early. If unplugging the sensor makes your problem go away, don&amp;#039;t be fooled. You&amp;#039;ve simply disabled the entire ABS, masking the symptoms. The sensor can be checked for proper function without replacing it. I suggest you get a mechanic who has a scan tool to check for trouble codes and a good multimeter to check that sensor, because it doesn&amp;#039;t sound like you&amp;#039;re ready to tackle this on your own. Something in the ABS is making that wheel brake by itself, so get it fixed soon.  DO YOU HAVE A CAR PROBLEM?  Just ask Mike about it. Send your questions to Auto Clinic, Popular Mechanics, 300 W. 57th St., New York, NY 10019-5899 or to pmautoclinic@hearst.com. While letters, faxes, phone calls or e-mail cannot be answered individually, problems of general interest will be discussed in the column. "^^<http://www.w3.org/2001/XMLSchema#string>
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