MOD NOTE: I'm editing this asking for the mods to delete this thread, as I had not initially seen another thread already covering this, so to avoid duplication I've copied my info there. Thanks. OK, so I'm resurrecting this from earlier in the month. I got the weird brake feeling again a few times with the heavy rains the last couple of days. When I initially hit the brakes for the first couple of seconds it feels very much like either air in the lines, or "brake fade" if you've ever had it: the calipers just don't seem to be grabbing. After a few moments it will then start to grab and slow me down. I did some testing, and here are my observations: - It appears to happen when the car is first driven after sitting in wet conditions for a bit (a couple of hours). - After the first instance or two in a driving session it stops being as prevalent (but can still happen to some extent) - It does not appear to be tires losing traction/hydroplaning: I had a section of parking lot where I could test and under identical conditions it would happen the first time, but not subsequent times - It is not the ABS system. I can feel that kick in, and deliberately engaged it during testing to compare... this is different. - I've not had it happen in dry conditions I've never had a disc brake car act like this when in good order. It's very disconcerting in that it it can easily double stopping distance when it happens if in mid-speed traffic. I'm wondering if the same rust/scale build-up that we notice on the rotors, and that may cause them to stick when parked over night, might be reacting with the moisture and preventing good brake-bad friction until it's been "scuffed off" after the first few braking applications in a given session? Has anybody else experienced anything like this?