13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE Mongoose/KXR 90/50 BRAKE DISK Measure the brake disk thickness. Service Limit: 3.0mm Measure the brake disk run out. Service Limit: 0.3mm Fluid Tube Bolt BRAKE MASTER CYLINDER REMOVAL Drain the brake fluid from the hydraulic brake system. Do not splash brake fluid onto any rubber, plastic and coated parts. When working with brake fluid, use shop towels to cover these parts. Remove the two master cylinder holder Bolts bolts and remove the master cylinder. When removing the brake fluid tube bolt, be sure to place towels under the tube and plug the tube end to avoid brake fluid leakage and contamination. 13-17