Quote:
Originally Posted by Boomer 2019
I also don't understand why BMW has covers over these vents in the first place. They don't completely block the flow, just reduce it by what appears to be about 50% -70%. They do state clearly that the covers need to be in place during all driving other than on a track, but I have not seen a reason stated for this. Anyone?
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They block junk going into the rotors along with a stream of water on wet days.
It's a good idea to clean up on the covers on a regular basis because they might clog up with bugs, rocks, plastics, etc