Hydraulic Unit Check

WARNING: This page is about a different variant/trim than selected.

equired Special Tools:

MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B (Vehicles without CAN communication system)

CAUTION:

The roller of the braking force tester and the tire should be dry during testing.
When testing the front brakes, apply the parking brake. When testing the rear brakes, stop the front wheels with chocks.

Jack up the vehicle. Then support the vehicle with rigid racks at the specified jack-up points or place the front or rear wheels on the rollers of the braking force tester.
Release the parking brake, and feel the drag force (drag torque) on each road wheel. When using the braking force tester, take a reading of the brake drag force.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOOK" (OFF) position before connecting or disconnecting scan tool MB991958.
Turn the ignition switch to the "LOCK" (OFF) position and set scan tool MB991958 as shown in the illustration.
After checking that the shift lever < M/T > or the selector lever < A/T > is in neutral, start the engine.
Use scan tool MB991958 to force-drive the actuator.
NOTE: The ABS system will switch to the scan tool mode and the ABS warning light will illuminate.

NOTE: When the ABS has been interrupted by the fail-safe function, scan tool MB991958 actuator testing cannot be used.

Fig 1: Connecting Scan Tool MB991958 To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Identifying ABS Warning Light Blinking Pattern
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Turn the wheel by hand and check the change in braking force when the brake pedal is depressed. When using the braking force tester, depress the brake pedal until the braking force is at the following values, and check that the braking force changes to the brake drag force inspected in step 2 when the actuator is force-driven. The result should be as shown in the diagram above.

BRAKING FORCE VALUES

Front wheel	785 - 981 N (176 - 220 lb.)
Rear wheel	588 - 784 N (132 - 176 lb.)

If the result of inspection is abnormal, repair according to Fig 3 .

Fig 3: Diagnosis Chart
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
After inspection, disconnect the scan tool immediately after turning the ignition switch to the "LOCK" (OFF) position.