phantom braking only on sharp left curves

I went looking for this issue, but it is so strange I haven't seen anything like it in an existing thread. I have had some strange things going on with braking for some time. A steep hill where I would lightly hold the brake to use the regen,coming into a right curve and it seemed like suddenly the braking totally stopped and it was briefly free wheeling. this was an ongoing thing that was startling, didn't seem to be a major problem, but I was watching it.

Recently I have managed to identify a specific left curve going down a steep hill picking up speed (I do drive aggressively on curves) and suddenly a short period where the car brakes without me touching pedals. seems to come from front tires, but difficult to be precise about that.

It feels like a fluid somewhere might be low and the centripetal force of the sharp left curve throws the fluid away from an uptake and somehow this causes the car to brake ???? I know it doesn't make sense to my primitive knowledge of how brakes work. (or don't) It would seem like lack of fluid would cause brakes not to work, but maybe some fail safe happening.?

I bought some transmission fluid and plan to check it and top it up (or possibly drain and replace if it's too nasty--I'm approaching 200k miles on my 2008 gen 2. i thought that might be connected somehow since the regen system was where anomalies first presented.

I was just reading a bit about zeroing in to check the brake fluid. So maybe that's the next order of business-I appreciate any thoughts, reference threads. I'd like some guidance. thanks

 

Thanks for the direction, in thinking about it, my tires are all the same, but I am very casual about tire pressure. In fact later saturday when I experienced perhaps the strongest phantom braking, the one rear tire was so low someone pointed it out to me in a parking lot. I'll bring them all to the same pressure and perhaps I'll get lucky. If that doesn't correct things I'll study up more on the braking system-- I was reading different details about regen braking actually varying with the battery state of charge earlier, so I think I understood your comment about the handoff to the hydraulic system, but I'm really getting out of my depth pretty quickly- sounds like a computer problem more than a mechanical one.

Again, thanks a lot for the information, I'll be able to do the tire pressure test weds, and will post results thurs.

 

OK, so just back from the test. I evened out the pressure in all the tires, and hit that curve tonight- and no phantom stepping on the brake pedal this time.

This whole thing has been a lesson about skid control in practice. I sort of knew the theory of skid control, but this is my first car equipped with it. And I couldn't have planned a better demonstration

The tires themselves were really extremely unbalanced- left front was somewhere north of 60, rear right was at 20. so even though the car wasn't actually skidding it thought it was. I have noticed the traction indicator before, but nothing red and lasting, so I didn't actually notice if the light came on in that split second when it braked earlier.

Thanks To everyone for the suggestions, they are greatly appreciated,

 

sorry, I thought from the earlier posts it was clear, but i just changed tire pressure to be equal in all 4 tires, and all tires were purchased new at the same time, same tire type just different air pressure, no other mechanical changes-rotations, balance weights alignments, just checked and adjusted tire pressure and the problem went away. those other things might have some effect on traction control braking as well, but they were not a part of this