Disc Pad Thickness Inspection

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Jack up the front of the vehicle and support it with safety stands.
Remove the wheel and tire. (See WHEEL AND TIRE REMOVAL/INSTALLATION .)
Verify the remaining thickness of the pads.
Minimum rear disc pad thickness

2.0 mm {0.079 in} min.
Replace the pads as a set (right and left wheels) if either one is at or less than the minimum thickness. (See DISC PAD (REAR) REPLACEMENT .)

Fig 1: Inspecting Disc Pad Thickness
Courtesy of MAZDA MOTORS CORP.