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first, pull the pads and carefully measure them. see if they are going down crooked.
if they are, then you need to look at the calipers. first carefully measure things for squareness and fitment to see if they are bent, have something preventing them from seating properly or some other reason that the frames of the calipers could be the culprit.
if that fails to show the problem, then you need to look at the pistons and how freely they move. if the frames are not the culprit, then likely you have a piston hanging up a bit, causing the pad to go down unevenly. this is a more likely culprit than the frames, as it would be hard to imagine both frames doing the same thing, and it is far more likely that the pistons are just not traveling well.
if none of that shows anything, then you need to measure your rotor temps, and if you find that the front rotors are getting really hot, i suggest that you increase your rear braking by changing the hydraulic bias toward the rear (which is not a bad idea to begin with on any of these cars, as they all need more rear brake, not front). we do that in the 968, with outstanding results. for us, it's a simple valve change. i don't remember how the various models of the 944 are set up.
of course, it could merely be that the brand of pads you have chosen do not play well with the particular brand of rotor. i am going through this right now on the SL550. the same brand of pad i use on everything (porterfield R4-S) is not playing well with the brembo rotors i have on the front of the SL-550, and are making noise. fine on the rears though. it happens.
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