Just to clarify the issue, when this happens and the pedal drops, does it feel like it is vibrating as well and you hear a buzzing noise?
The fact that you are thinking it feels like an ABS activation is probably what is happening. If this seems like it happens in a turn then most likely you have a speed sensor issue and the ABS thinks that one tire is slipping and so it pulses the brakes. When this happens the pedal does feel like it drops. Have they found any codes when this happens?
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
Also, is there a chance that you just replaced one or two tires?
The way to rule this out is to graph all the wheel speed sensors with a scan tool and then make turns to get this to act up and watch the graph. Each of the wheel speed signals should remain steady and pretty even. Clearly they are going to vary a little bit but we are looking to see if one or two of them are a different speed by more then 2 or 3 MPH when this happens. Obviously we are going to need to have a scan tool capable.
Let me know about this info and we can go from there. Thanks
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Tuesday, July 21st, 2020 AT 4:30 PM