Let me try to help.. did you replace the master cylinder? If so how do you verify no air got into the ABS module? Sure it it was just calipers the tool would not be needed, however, you continue to have problems.. so I'm offering a possibile solution. If you had a leak, that would be obvious, so I'm assuming no leaks, and lines or hoses won't give you the sponge pedal unless there is a leak.. so air is possible.. one more possible, a bad master cylinder... Yes, my first ever job was a master cylinder replacement.. the remanufactured unit had some metal shavings and needless to say, had to be replaced as well.So based on what I read about it ensures I got new fluid through system I'm not sure I need this. I bought a gallon of fluid and watched the fluid color change in the vaccum bleeder we used from a dingy brake fluid to a nice golden colored fluid.
And then there is this statement...
Remember that this is the process for FLUSHING AND FILLING YOUR ENTIRE SYSTEM. If you are only replacing a caliper or performing any other operation where you are simply trying to bleed vapor and/or used fluid from the wheel-end components (like after a hard day of lapping,) you need only to bleed the brakes as you normally would...ala Step #1 above.
There is no reason to cycle the ABS if all you are simply trying to do is get vapor out of the calipers. For this reason, if you flush and fill your system only once per year, the rest of the time you will not need to perform the ABS cycling procedure…or worry about the service tool at all.