2007-2009 Kawasaki KFX50 service manual, Page 199Get this manual
13REAR WHEELSWING ARMHYDRAULIC BRAKE I INSPECTION Check the cylinder inside wall, and spring for scratch, corrosion or other abnormal conditionIf any abnormal condition is found, replace the inner parts or master cylinder
Cylinder Inside Wall ASSEMBLY Before assembly, apply brake fluid to all removed partsDuring assembly, the main piston and spring must be installed as unit without exchangeWhen assembling the piston, soak the cups in brake fluid for whileInstall the cups with the cup lips facing the correct direction