Just had my Twizy taken in to fix a brake fluid leak from one of the rear callipers... The STOP light came on intermittently and got worse over a couple of miles. Seemed OK on downhill so I figured it must be brake fluid level!
Anyway, I think there was a recall for this in 2012/2013 maybe, so it's interesting this happened on my late 2014 car - perhaps they've not really fixed it?
On the plus side, Renault ZE assistance have been very helpful - so far. They organised a tow truck and a courtesy car. The tow took about 3 hours to arrive, but in terms of their organisation of it, it's all be fine. The dealer's not actually put the new calliper on yet, and I'm probably going to have to pay them £190 for new pads fitting on the rear (which seems a bit steep since they're doing half the job to replace one calliper anyway...) so I'll reserve judgement of the whole process until I actually get the car back..!