ABS activates, no lights (ABS or Stability control) on 2012 TRD

1972GMC

New Member
First time here. I recently changed the loaded struts on the front, and rebuilt the rear brakes, and put several hundred miles on with no issues. The ABS light and stability lights came on intermittently, but have been off for the last 150 miles or so. When applying the brakes, I can feel the antilock kicking in, and there is a whirring noise someplace up front. I'm thinking I knocked some stuff loose, and need to clean the wheel speed sensors. Has anyone exprerienced this, and am I on the right track?
 
Curious. Why did you need to "rebuild" the rear brakes? This is the area which is most likely where the problem is located.
 
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