They are not for dust, they are splash shields to keep water from hitting the hot rotors and pads.
I have them on the front just because I thought they looked cool. New ones from Ford were $11.00 each. The donor ones I had were in pretty bad shape. Can't get new ones for the T-Bird rear hubs though so not using any in the back.
I can't imagine they would make a difference either way on one of these cars because they are mostly fair weather vehicles. IMO
Ford had a reason to put them there, but a Cobra is not a Ford. I know people who've removed the shields from their street Mustangs and had no stopping issues in wet driving. Perhaps water hitting hot rotors results in surface cracks? I would think Ford's main reason was for dust control. Plus removing the shields probably insreases air flow to the disks so your brakes run cooler.
Bottom line, lots of people are running with and without the shields with no issues so do as you please and enjoy!
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