16. BRAKE SYSTEM MXU 500IRS Dust Boot Snap Ring Remove the dust boot. Remove the snap ring, then remove the piston and spring together. INSPECTION Check the cylinder inside wall for scratch, corrosion or other abnormal condition. If any abnormal condition is found, replace the master cylinder. Check the spring and piston for scratch, corrosion or other abnormal condition. If any abnormal condition is found, replace the parts. 16-29