2006 Arctic Cat DVX 400 Service Manual, Page 146Get this manual
Front Brake Lever Master Cylinder Assembly NOTE: The master cylinder is non-serviceable component; it must be replaced as an assembly
REMOVING
1Place shop towel under the brake hose union bolt and disconnect the brake hose
4Pull the rubber boot (5) out; then remove the circlip (6)
! CAUTION
Brake fluid is highly corrosiveDo not spill brake fluid on any surface of the ATV