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If its in the middle of the pad it was there for ventilation, when I bought some porterfield super performance brake pads for my BMW they also had a slot down the middle. And as for the rotor, it the grooves are near the edge of the rotor it was from the rotor wearing away and the part not contacting the brake pad staying original width. Which reminds me, when I brake I get a pulsing sensation, I think its from a warped rotor (when I spun the wheel I could hear it touch the pad everytime it got to the high spot). How could that have happened, and how much would it cost to get it machined or replaced? Sorry for the thread jack BTW.
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