[. . . ] Always allow components to cool before attempting to service your bike. The Following procedures cover the installation of Hayes Disc Brakes items MASTER CYLINDER REBUILD - 98/99 DH Purple, Comp, HFX-Mag/Mag Plus A. 2. 98/99 and DH Purple Remove the small retaining ring on the lever pivot by prying it off with a small screwdriver. [. . . ] Step B-13 Warning: Always wear safety glasses when removing a snap ring. Insert the 24-gauge wire (supplied in MC piston service kit) through the barb end of the cartridge pushing the cartridge piston out of the master cylinder cartridge. The cartridge spring and spring guide will also come out of the cartridge. Thoroughly clean all the parts by spaying them with isopropyl alcohol and wiping them with a clean rag. Begin reassembly by dropping the cartridge spring into the cartridge ­ make sure the spring falls directly into the center of the cartridge. Install the new master cylinder piston into the cartridge over the spring and spring guide. Install the ball end of the threaded push rod into the master cylinder piston. Push on the push rod to assure the spring assembly is lined up correctly. Using a snap ring tool, install the snap ring into to the snap ring groove on the inside of the cartridge. Push on the threaded push rod to assure that all parts are properly in place. [. . . ] With a 13mm wrench, thread the jam nut onto the end of the cartridge and torque the nut to 50 in-lbs +/- 5 in-lbs. Put the adjuster bushing into the hole in the lever blade and thread the push rod of the cartridge through the hole in the bushing. [. . . ]