13. BRAKE SYSTEM ATV 300/250 Screw Fluid Inlet Duct Remove the screw and remove the fluid inlet duct. Check the O-ring for wear or damage and replace if necessary. O-ring Seal Boot Remove the two nuts and remove the seal boot. Nuts Remove the circlip and then pull out the push rod, washer, piston and spring. Circlip Push Rod Washer Spring INSPECTION Check the cylinder inside wall, and spring for scratch, corrosion or other abnormal condition. If any abnormal condition is found, replace the inner parts or master cylinder. Before assembly, inspect the lst and 2nd rubber cups for wear. Piston 13-14