2004 Ski-Doo REV Series Factory Service Manual, Page 262Get this manual
Section 06 TRANSMISSION Subsection 05 (BRAKE)
Disconnect the switchTake out the master cylinder from the handlebarOverturn the master cylinder so that the bottom is on the topFix the master cylinder in rigid way preferably in visePull out the switch wire and rubber coverActivate the parking brakeWith the help of proper tool, unscrew the switch body paying attention to apply torque in axial direction with steps of little torque angles and paying attention to not apply force in radial direction (flexion)Remove the glue remaining with alcohol on piece of cotton and then clean the seat threads with the clamp screwIf there is resistance to the advance of the clamp screw, use proper wrenchNOTE: In case of switch body breaking during the unscrewing activity, act mechanical restoring the threads on master cylinder seat and then go on with the installation procedure