Brakes problem
2001 Chrysler Sebring 6 cyl Two Wheel Drive Automatic 95000 miles
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Replaced all four rotors and pads one year ago. Noticed that pedal started feeling soft about a month ago. Pulled all four wheels and found that front brakes are barely wearing but rear are wearing much more (but still plenty of pad left.) Manual indicates that master cylinder is split so that one circuit it controls FR and RL and other controls FL and RR, so it doesn't appear to be master cylinder related. Both lines also go to proportional valve, so I would say valve is OK. Any thoughts on cause/next steps?

Pull front and rear calipers off and look inside the dust boots, if a seal is leaking this is how to find it...