13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE Mongoose/KXR 90/50 INSPECTION Inspect the inner surface of the brake drum is scratches, polish brake drum lightly and evenly with emery cloth. Measure the inside diameter of the brake drum. Service limit: 131mm Replace it if it is out of specification. Measure the front brake lining thickness (A). Service limit: 2.0mm replace it if below INSTALLATION Reverse the "REMOVE" procedures. 13-23