Minimum Pad Thickness

Replace the pads when the thickness is worn to within 0.76 mm (0.030 inch) of the shoe. Replace all pads in axle sets.

Measure the flatness of the inner and outer pads. Place the pad surfaces together and measure the gap between the surfaces. If more than 0.13 mm (0.005 inch) gap exists midway between the attaching lugs, replace the pads.