Brake Master Cylinder Problems of Nissan Leaf

Oct 2017, Leaf pulled out of parking lot from shopping trip ok, drove pass 1 stop sing ok (right turn, stopped) then lost brake function at up coming right light stop, no abs, no traction control, no normal brake feedback, no 'engine brake' (simulation or re-generative braking), without any noticeable warning such as beeping sound. Panic, tried to press 'park' no reaction, the car feel like accelerating towards upcoming stopped traffic, looked down, make sure foot is on brake pedal, confirm no brake action but it didn't accelerate the car. Try hard brake to floor and steer car to between lane, all wheel locked with sqeeeeki noise, car slipped and stop between 2 stopped car. Speed limit of the road 35miles/hr outside temperature 91f clear sky. The car was at 49249 miles. Managed to pull the car to roadside parking lot, called tow truck tow back to dealer I got it from just 30days ago, svc dept. Checked said they found no mechanical issue with brake system and 12v battery ok. Turn over the car to autonation Nissan tempe az. Initial check said 12v battery not passed test and voltage dropped below 10v, they said drop or unstable 12v may cause this. I brought to their attention driver window control is abnormal which may also cause 12v unstable, and another dealer checked the battery and it passed. Replaced 12v battery as requested, old battery core measured with volt meter at 12. 56v. Tech came back stated 'brake master cylinder and brake control system bus need replacement. Parts will take 1 weeks to order. Nissan ev customer relation involved. 7days later called dealer again, told parts just arrived. Customer relation guy related dealer will still take a look on window switch but they think the new battery stabilized the 12v and window motor should not affect 12v voltage. (they still have not put in the replacement part and test yet?!) will update result if I can.

See all problems of the 2013 Nissan Leaf 🔎.