2003 Ski-Doo REV Series Factory Shop Manual, Page 191Get this manual

2003 Ski-Doo REV Series Factory Shop Manual, Page 191

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Section 05 TRANSMISSION Subsection 06 (BRAKE)
17, Brake Disc
Check for scoring, cracking or bending, replace as requiredCAUTION: Brake disc should never be machined
Countershaft Bear