Just read this thread since it's been kicked to the top of the pile again and noticed that no one has given the easy DIY answer to this issue. That is, to go out and - at least occasionally (see below) - use the brakes as they were "meant" to be.
The 911 is a sports car and Porsche has done more than most manufacturers to equip its sports cars to cope adequately with the kind of use some (many?) of its drivers could be expected to subject it to.
Amongst those measures, the cars are equipped with relatively "hard" brake pads to resist fading under heavy use and - combined with a relatively low degree of servo assistance - to give good pedal feed-back allowing better brake-force modulation by the driver's right foot.
A down-side of these hard brake pads is that their surfaces tend to "glaze" under extended light use of the brakes, as you might tend to have when the car is driving in city traffic or long hold-ups.
The solution is to take the car to a fast road with no other traffic and no nosy onlookers with a phone to hand (sometimes easier said than done) and do several very hard stops from high speeds. The hard stops take off the thin layer of smooth, glazed mixture of abraded friction material and oxidized iron from both the brake pads and discs which, apart from negatively affecting braking performance, promotes squealing. This procedure might have to be repeated from time to time, depending on the nature of the car's regular use.
This is the same procedure as can also be used to quickly break in (no word-play intended) new brake pads and discs.
Even if a car is not used extensively in slow traffic, the manner in which a driver brakes can promote the build-up of glaze. Track drivers who brake more moderately well in advance of a bend, instead of harder and later, are known to suffer from glazed race pads with harder racing pads.
To those who think that the answer to this "issue" is for Porsche to fit softer brake pads as standard, I would recommend some other car brands whose manufacturers follow a different philosophy when developing their sports cars.
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