1999 GMC Yukon Anti-Lock Brakes Pulsing Incorrectly

Tiny
JIMWINDSTAR
  • MEMBER
  • 1999 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 187,000 MILES
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?
Wednesday, September 23rd, 2009 AT 7:36 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Has the ABS light come on? Also, check the sensors at each wheel. Chances are one is damaged or disconnected.
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Monday, October 5th, 2009 AT 11:02 AM
Tiny
JIMWINDSTAR
  • MEMBER
  • 2 POSTS
No-my ABS light has not come on and nothing seems disconnected.
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Monday, October 5th, 2009 AT 6:06 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
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.
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Monday, October 5th, 2009 AT 8:20 PM

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