Mazda 6 Service Manual: No.26 exhaust sulphur smell

No.25 a/c is not cut off under wide open throttle conditions

No.27 constant voltage

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Mazda 6 Service Manual: Contact Authorized Mazda Dealer and Have Vehicle Inspected
If any of the following warning lights or the indicator light turns on/flashes, the system may have a malfunction. Contact an Authorized Mazda Dealer to have your vehicle inspected. ...

Mazda 6 Service Manual: Rear brake (disc) removal/installation
1. Remove in the order indicated in the table. 2. Install in the reverse order of removal. 3. After installation, depress the pedal several times, rotate the wheel by hand, and verify that the brake does not drag. Disc Pad Installation Note 1. Turn the manual adjustment gear counterclockwi ...