2007-2009 Suzuki LTZ90 factory service manual, Page 172Get this manual
CHASSIS
INSPECTION AND DISASSEMBLY
BRAKE DRUM Inspect the brake drum and measure the brake drum I.Dto determine the extent of wearReplace the brake drum if the measurement exceeds the service limitThe value of this limit is indicated inside the brake drum09900-20101:Vernier calipers Brake drum I.D Service Limit: 130.7 mm (5.14 in) BRAKE SHOE Inspect the brake shoes for wear or damageIf any wear or defects are found, replace the brake shoes as set