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THATS THE RUBBER PART INSIDE THE CAP... PULL IT OUT, TRASH IT, AND GET A NEW CAP..
iF YOU HAVE YOUR BRAKE FLUID FLUSHED BY A PROFESSIONAL WITH A PRESSURE BLEEDER, YOU WILL BE OK
i would change the rubber brake lines and your calipers, DO NOT WAIT!, i see your spending alot of money on your stereo, why not spend some money one a SAFETY ITEM!