C Yukon 2WD V8-5.7L VIN R (1999)
Brake Shoe: Specifications
Replace shoe and lining assemblies when the thickness of any lining is worn to within 0.76 mm (0.030 inch) of the shoe.
Replace riveted shoe and lining assemblies when the lining is worn to within 0.76 mm (0.030 inch) of any rivet head.