I've had brake booster issues with both my DA9s and got similar symptoms. I couldn't justify fixing it as the brake boosters were $700 a pop for new ones and I don't trust second hand brake gear. I just put up with it. When my master cylinder went my pedal just dropped to the floor, before that it had a rock solid pedal then about 6 months later I started getting the squishy pedal, I just learnt to live with it.
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