13. BRAKE SYSTEM MXU 300/250 Remove the screw and remove the fluid Screw Fluid Inlet Duct 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 13-17