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I did not experience anything like this in the 18k/19k miles I had my '16 1SS.
I am not trying to say there is no issue. Simply reporting the point.
What is being described, I agreed with others, as being related to the ABS system. The likelihood of a mechanical or hydraulic related issue is very low. 1. The safety margin on systems like that, from a hyrdo-mechanical design standpoint, are high. 2. You would have clear signs of something going wrong (i.e. leaks, brake dust signs, vehicle pulling, noises, etc.) 3. You would have a systematic, full-out failure - it would not go away and come back...
The description of pulsating/vibration and a lack of feel in the pedal, with very low stopping power describes a situation with the ABS doing "something".
Now, I can relate to the OP and others with this problem: Autocross and ABS "ice-mode":
"Ice-Mode", as people commonly call it, is a phenomenon that can occur with an ABS system when the ABS module sees a deceleration rate quicker than it deems ration compared to the ABS module programming. So, the ABS module will assume the vehicle is potentially on ice and will heavily cycle the ABS or the ABS module will get tripped-out and dump all pressure in attempt to allow control of the tires back to the driver. The ABS is thinking the vehicle's brakes/tires are locked in a skid, rending a driver in a low-control situation. This is something that enthusiasts run into when they place drastically more sticky tires on the car, aggressive brake pads or are overly aggressive with brake applications+overly aggressive with steering/car placement (here lies the importance of ABS systems developed on track car offerings).
What you end up feeling is the ABS will pulse erratically, cease pulsing, the pedal will drop some, the pedal will become stiff/numb in brake feel, and the vehicle will stop (decelerate) at a very low rate, almost nil.
Let me ask this: for those that had the issue, was it seen during or even right after a hard rain?
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