1999 GMC Yukon Anti-Lock Brakes Pulsing Incorrectly

1999 GMC YUKON
187,000 MILES • V8 • 4WD • AUTOMATIC
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JIMWINDSTAR
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  • 2 POSTS
My anti-lock brakes pulse prior to stopping when the road is not slippery - or as if there is a slippery surface when it isn't.

Is there something obvious-e.g. a disconnected wire or something?
Sep 23, 2009 at 7:36 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Has the ABS light come on? Also, check the sensors at each wheel. Chances are one is damaged or disconnected.
Oct 5, 2009 at 11:02 AM
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JIMWINDSTAR
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No-my ABS light has not come on and nothing seems disconnected.
Oct 5, 2009 at 6:06 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Check closely for damage to the wiring going to the sensors. I've seen many that were rubbed through or broken. Also, I will assume you made sure the brake fluid is full.

Has the ABS light ever come on? If not, there may be a problem with the computer. You may want to have the computer scanned even though the light hasn't come on. Most parts stores will do it for free.
Oct 5, 2009 at 8:20 PM
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