1985 Ski-Doo snowmobile Service Manual, Page 295Get this manual
Section 03 TRANSMISSION Sub-section 06 (BRAKE)
ADJUSTMENT
Control lever travel
Brake should apply fully while the brake control lever is approximately 13 mm (12") from the handlebar gripIf adjustment is required, turn the brake cable adjuster counterclockwise until the brake disc can no longer turn then back off the adjuster approximately 12 turnsRecheck brake operation