If you have our OBD scanner using for a C5 and C6 to properly bleed the brakes and also the ABS is use the Bi-directional mode and select the ABS/TCS signal set.

You can turn on the in and outbound solenoids to properly bleed the whole system.
Best is to use a battery charger while doing the full brake/ABS flushing since ign key would be on while connected to the EBTCM controller with the scanner

Attached Files ABStest.jpg

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True Custom Performance Tuning