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- RDX Aspec Adv.
This sounds to me like possibly some air got into the hydraulic system. Might just need the brakes bleed. A good mechanic at the dealer should easily be able to diagnose that.
Mazda has a service bulletin out for rear brake wear, it's not a "feature" like Mike.M is opining. I looked into it, lol
Mazda Service Bulletin 04-003/14