Rear Brake Disc Thickness Check

Check the brake pads for wear and fade.
Check the brake disc for damage and cracks.
Remove all rust and contamination from the surface, and measure the disc thickness at 8 points, at least, of same distance (5mm) from the brake disc outer circle.
Brake disc thickness

Standard: 10 mm (0.39 in)

Service limit: 8.4 mm (0.33 in)

Deviation: less than 0.01 mm (0.0004 in)

Fig 1: Measuring Rear Brake Disc Thickness
Courtesy of KIA MOTORS AMERICA, INC.
If wear exceeds the limit, replace the discs and pad assembly left and right of the vehicle.