2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 282Get this manual
FRONT AND REAR BRAKES EB702060
FRONT BRAKE MASTER CYLINDER ASSEMBLY
WARNING
All internal brake components should be cleaned and lubricated with new brake fluid only before installationRecommended brake fluid: DOT 4
Whenever master cylinder is disassembled, replace the piston seals and dust seals
EB702060