How did you attempt to pull ABS codes? The only way I know of is with a
Tech 1. Only the ECM can flash codes, not the EBCM.
In any event if the click you hear is from the ABS hydraulic unit, and
you're saying that it (the pump motor) doesn't click when the ENGINE,
(and the engine compartment) is warm, than I would suspect the problem
is there, in the hydraulic unit.
But, since the price of a reman hydraulic unit is $1,667.59 at NAPA, I
might just accept that the ABS is dead on your antique GA.
Or, you could try flushing all the fluid, and cycling the pump with
jumper wires, and cleaning the electrical connections, and it might come
back to life for a year.
On my '95 TranSport one of the gears came off its motor in the ABS
unit. Took it apart to find out what was wrong - fixed it and put it
back together. After the ABS unit started working I was able to find
the blown brake line - - - - - - - . Up until then, I had no rear
brakes, and no indication other than the ABS light on. No fluid loss,
pedal hard and high.
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