Hydraulic Control Assembly - Antilock Brakes: Service and Repair

HYDRAULIC UNIT INSPECTION
^ Check hydraulic unit for fluid leakage.
If any, repair or replace.

SOLENOID VALVE INSPECTION

1. Turn ignition switch "OFF".
2. Disconnect solenoid connector.





3. Check that resistance is 2.9 - 3.2 ohms at 20°C (68° F)between terminals and whether or not short circuit between each terminal and hydraulic unit body exists.
Between terminals:
1 and 3
2 and 4
5 and 7
6 and 8

Between each terminal and unit body: - (infinity)
If faulty condition was found, replace hydraulic unit.

PUMP MOTOR INSPECTION





1. Turn ignition switch "OFF".
2. Disconnect motor connector.
3. Check motor for resistance.
Between motor terminals: Less than 1 Ohms at 20°C (68°F)
Between terminal and motor body: 1 M Ohms or more





4. Connect 12 V battery positive terminal to motor connector terminal "1" and negative terminal to "2". Then check if operation sound is heard from motor. If faulty condition was found in Steps 3) or 4), replace hydraulic unit.

REMOVAL

1. Disconnect negative cable from battery.





2. Using special tool, disconnect brake pipes from ABS hydraulic unit.
Special Tool (A): 09950-78210

NOTE: Put bleeder plug cap onto pipe to prevent fluid from spilling. Do not allow brake fluid to get on painted surfaces.





3. Disconnect ABS hydraulic unit connectors.
4. Remove three nuts and takeout ABS hydraulic unit from bracket.

CAUTION:
^ Do not give an impact to hydraulic unit.
^ Use care not to allow dust to enter hydraulic unit.
^ Do not place hydraulic unit on its side or upside down. Handling it in inappropriate way will affect its original performance.

INSTALLATION





1. Install hydraulic unit by reversing removal procedure.
Tightening Torque
(a): 16 Nm (1.6 kg.m, 12.0 ft. lbs.)
(b): 21 Nm (2.1 kg.m, 15.5 ft. lbs.)
2. Bleed air from brake system.
3. Check each installed part for fluid leakage and perform hydraulic unit operation check.