[ilmiont]

Checked the car this morning... cardboard dry, reservoir level unchanged.

Feeling a bit ridiculous now but that reservoir genuinely looked the same colour throughout and I couldn't see anything moving when I shaked it lightly last week. Combined with the mess on the ground and the "brake fluid low" DIM message, I feel like I had valid grounds to assume it had lost its fluid...

Anyway, it hasn't lost any substantial amount of brake fluid after all, the stuff on the ground can't be mine, and the DIM message... still a bit odd but I guess just a momentary bad sensor reading.

The fault now then is just that the brake pedal is soft, gains pressure when pumped, then loses it again.