Panic Stop, now no brakes and Puddle of fluid?

[BimmerDude11]

My guess would be the brake lines that go to the rear.

Under the X5 underneath the driver's door, remove the plastic cover. The lines bend from vertical to horizontal to the rear. Between there and the 1st bracket that holds the lines up water travels down this section and rusts out. If you're parked on level ground you may not notice a leak as the plastic cover can hold a lot of liquid.

I had changed the front brake hoses and that was enough of a pressure change to finally burst those rear lines. I would imagine that a panic braking could do the same thing.

Good luck in the search.

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