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Hydraulic Modulator Gears: Installation

  1. Install gears in original position. DO NOT allow gears to turn during installation of nut in center of gears. Piston in hydraulic modulator can hit bottom of bore, damaging piston. Insert a drift through holes in gears (not between gear teeth). See Figure.
  2. Insert drift through to recessed hole in hydraulic modulator base. Install gear retaining nuts. Torque gear retaining nuts to specification. See TORQUE SPECIFICATIONS  table.
  3. With hydraulic modulator and master cylinder assembly upside down (gears facing upward), rotate each gear counterclockwise until movement stops. Rotating gears counterclockwise will position pistons very close to top of hydraulic modulator bore, making brake bleeding easier.
  4. Position motor pack onto hydraulic modulator, aligning 3 motor pack gears with hydraulic modulator gears. Install motor pack attaching screws. Torque motor pack screws to specification. See TORQUE SPECIFICATIONS  table.
  5. Install gear cover onto bottom of hydraulic modulator. Torque gear cover screws to specification. See TORQUE SPECIFICATIONS  table. Install hydraulic modulator and master cylinder assembly onto vehicle. Bleed brake system. See BLEEDING BRAKE SYSTEM .
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