Not allways but more often in last day. Light goes on for a while and then off but not necessarily at same time. Rear brakes were down, changed the pads. Fronts 1/2 good. Fluid never below 3/4 full. Brakes work fine until the last 3-5 feet of lignt/slow/normal braking then the pulsation until stopped. Not just a slight vibration but a full blown pulsation and appropriate sound. No roter warp pulsation.
The truck towes fairly often but trailer has 4 wheel brakes that work well.
SOURCE: 1998 GMC 1500 4x4 4.3L ABS brake problems
Or you could just pull the fuse for the abs and not have abs but you won't wreck from pulsating pedal.
SOURCE: When braking on hard surface, just before dead
There was a TSB on this issue with your Sierra, a faulty or dirty ABS sensor is the cause of this problem. The fix is simple, just clean the ABS sensor at the front hub with brake parts cleaner and inspect the wire leads. At worst you may have to replace the sensor it self. Good luck
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