The main common factor I can see is that the problems so far reported are with diesels. The only reports I can find on the US forums are also Europeans with diesels.
The S40 pdf on brakes says: "The power brake booster (servo) is single acting and has an integrated mechanical function for Emergency Brake Assist (EBA). The power brake booster is connected to the engine's intake manifold and to a vacuum pump. Cars with gasoline engines have an electrical pump, while diesel engined cars have a mechanical pump."
Maybe its something to do with the mechanical pump?
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