For the most part, the van runs flawlessly now except for this one issue. At speeds over 75, the ABS light comes on, followed by the regular red parking brake light. Once I decelerate below 75, the red light goes out, and then the ABS light goes out as well. No stored codes. This is a 94 G20 with a 5.7l. The brakes work fine as far as I can tell, have plenty of pad left.
I took it to a mechanic, they said they couldn't duplicate it (which is total BS as I can get it to come on every time with no issue), so I'm looking for ideas as to what it could be and try to deal with it myself.
Any advice is greatly appreciated.