BMW X4 Owner's Manual page 179

Things to remember when driving Driving tips
Corrosion will built up when the maximum
pressure applied to the brake pads during
braking is not reached - thus discs don't get
cleaned.
Corrosion buildup on the brake discs will cause
a pulsating effect on the brakes in their re‐
sponse - generally that cannot be corrected.
Condensation under the parked
vehicle
When using the automatic climate control,
condensation water develops collecting under‐
neath the vehicle.
These traces of water under the vehicle are
normal.
I n f o r ma t i o n P r o v i d e d b y :
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Online Edition for Part no. 01 40 2 964 144 - VI/15