1970-1979 Ski-Doo Snowmobiles Service Manual, Page 142Get this manual
POWER TRAIN bBack off castellated nut slightly and secure with hair pin keepercTighten small cone nut then back off one turndAdjust brake cable for in(25mm) gap between brake lever and handlebar grip when brake is fully appliedeCheck operation of brake light and loosen and adjust light switch locknuts if necessarySelf-Adjusting Disc Brake (Non-Bombardier Type) RemovalInstallation