2006 Ski Doo REV Service Shop Manual, Page 52Get this manual
Section 02 TROUBLESHOOTING Subsection 03 (DRIVE AND BRAKE SYSTEMS)
BRAKE SYSTEM
SYMPTOM SPONGY BRAKE CONDITION
CONDITION
TESTINSPECTION
NORMAL USE 1Contaminated brake fluidReplace brake fluid and bleed systemIf the problem persists, replace master cylinderBRAKE FLUID LEAKAGE
SYMPTOM
CONDITION
TESTINSPECTION