Thanks for the schematic. It's not too much help other than to notice that there seems to be big white space in front of the actual piston. There seems to be a lot of confusion about whether you can floor the brake or not. I'm here to tell you that you can.
I didn't say you cannot floor the pedal. In fact, that is exactly what happened to the OP in the link that I provided. What I did say is that there is a direct connection to the brakes. But I should be more clear. I meant from the master cylinder. But I do see what you mean about the white space! I certainly could be wrong, but I suspect the problem you are describing is in the ABS system and how it is implemented on the wheel cylinders. We had some discussions about that in the other thread. While we did not have details on what is implemented in the LEAF, we discussed generic systems. One possibility in that case was malfunction of the ABS system repeatedly releasing small amounts of fluid. Of course, that doesn't happen in the case you described with the power off.
karlboekelheide wrote:I'm also very disturbed by all the comments about how your brakes are screwed if your 12v battery isn't up to snuff. I don't think we should be at the mercy of so many easy to fail parts in order to have brakes. 12v batteries can fail in odd ways at odd times. What I really don't like being at the mercy of is Nissan programmers. There's way too much logic in the car. Having spent my working life time working with fail safe systems I know leaving out a direct mechanical connection to the brake pads is a real mistake.
Are you aware that there is an ultracapacitor in the back of our LEAFs which has the sole purpose of holding up the 12V to allow for sufficient braking in the case of a crash? It takes the place of the coffee can that used to hold a partial vacuum in old cars. In fact, when Nissan updated the firmware on my brakes, they could not release the car to me because the pedal went all the way to the floor. Apparently, I was the first one to get that work done at that dealership and the technician did not perform the steps which recharged the ultracapacitor. Without that capacitor charged, there was little to no braking. I don't know for sure, but I suspect that below a certain battery voltage the ultracapacitor is actively discharged to allow maintenance to be safely performed five minutes after the battery is disconnected from the car.
karlboekelheide wrote:What I don't see in any of the posts I'm looking is any communication with Nissan. Has anybody gotten an official response from them? I plan to start calling and writing next week.
I have directly communicated with Nissan on this topic, including in person and on this forum in threads that were read by them
. IMO, they do not seem overly concerned.