13. HYDRAULIC BRAKE K-PIPE 125 DISASSEMBLY Remove the piston rubber cover and snap ring from the brake master cylinder. Snap Ring Pliers Master Cylinder Remove the washer, main piston and spring from the brake master cylinder. Clean the inside of the master cylinder and brake reservoir with brake fluid. Spring Main Piston Snap Ring INSPECTION Measure the brake master cylinder I.D. Inspect the master cylinder for scratches or cracks. Service Limit: 12.75mm replace if over Measure the brake master cylinder piston O.D. Service Limit: 12.64mm replace if below 13-7