Hydraulic Control Unit (HCU) Removal/Installation: Removal/Installation

All vehicles 

1. Remove the air cleaner and the air cleaner outlet pipe. See AIR CLEANER OUTLET PIPE REMOVAL/INSTALLATION -- 2.5L or AIR CLEANER OUTLET PIPE REMOVAL/INSTALLATION -- 3.0L .
2. Disconnect the master cylinder brake tube fittings from the HCU.
   • To install, tighten to 23 N.m {2.3 kgf.m, 17 ft.lbf}.

Vehicles with 3.0L engine 

1. Disconnect the master cylinder brake tube fittings from the master cylinder and remove the brake tubes.
   • To install, tighten to 23 N.m {2.3 kgf.m, 17 ft.lbf}.

All vehicles 

1. Disconnect the front brake tube fittings from the HCU.
   • To install, tighten to 15 N.m {1.5 kgf.m, 133 in.lbf}.
   NOTE: The brake tubes must be installed in the same location as removed.
2. Disconnect the rear brake tube fittings from the jumper tubes.
   • To install, tighten to 15 N.m {1.5 kgf.m, 133 in.lbf}.
     Fig 1: Disconnecting Electrical Connector

     Courtesy of MAZDA MOTORS CORP.
3. Disconnect the electrical connector by rotating the protective cover.
4. Remove the 3 HCU bracket-to-frame bolts and remove the HCU.
   • To install, tighten to 20 N.m {2.0 kgf.m, 177 in.lbf}.
5. To install, reverse the removal procedure.
   • Bleed the brake system. See BRAKE SYSTEM BLEEDING .