Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
The only thing that I can think of is that you might not be using the correct bleeding sequence: You must do Right Rear, then Left Front, then Left Rear, then Right Front. The air will not come out if not bled diagonally and with the auto brake bleed performed with a scan tool.
Here is that procedure in case you need to look it over as reference:
The ABS Automated Bleed Procedure uses a scan tool to cycle the system solenoid valves and run the pump in order to purge any air from the secondary circuits. These circuits are normally closed off, and are only opened during system initialization at vehicle start up and during ABS operation. The automated bleedprocedure opens these secondary circuits and allows any air trapped in these circuits to flow out away from the brake modulator assembly, which is then forced out at the brake corners by the pressure bleeder.
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