Inspection

INSPECTION





Checking Hydraulic Unit
1) Check connected and fixed condition of connector.
2) Open hydraulic unit relay box and check for discontinuity or short circuits.

Checking the Hydraulic Unit Operation By Pressure Gauge

1) Remove the FL and FR pipes from the hydraulic unit





2) Connect two pressure gauges to the hydraulic unit.

CAUTION:
- Pressure gauges used exclusively for brake fluid must be used.
- Do not employ pressure gauge previously used for transmission since the piston seal is expanded which may lead to malfunction of the brake.

3) Bleed air from the pressure gauges.
4) Perform sequence control.





(1) Connect diagnosis terminals to 3 terminals (K) and 6 terminals (L) of the diagnosis connector beside driver seat heater unit.
(2) Turn ignition switch ON.
(3) The ABS warning light comes on.
(4) Depress the brake pedal within 0.5 seconds after the warning light goes out so that the pressure gauge registers a pressure equal to the initial value.

CAUTION: Do not depress the clutch pedal.

NOTE: The engine must not be operating.

5) When the hydraulic unit begins to work, and first the FL side performs decompression, holding, and compression, and then the FR side performs decompression, holding, and compression.





6) Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets the standard values. Also check if any irregular brake pedal tightness is felt.





- In case of hydraulic unit plunger piston malfunction:
7) Remove pressure gauges and RL and RR pipes from the hydraulic unit.
8) Connect the FL and FR pipes to the hydraulic unit.
9) Connect two pressure gauges to the hydraulic unit.
10) Bleed air from the pressure gauges and the FL and FR wheel cylinders.
11) Repeat step 4) procedures.
12) The hydraulic unit begins to work, and simultaneously the RL and RR wheel cylinders perform decompression, holding, and compression.
13) Read values indicated on the pressure gauges and check if they meet the standard value.
14) After checking, remove the pressure gauges from the RL and RR pipes and connect the RL and RR pipes to the hydraulic unit, and bleed air.

Checking the Hydraulic Unit With Brake Tester





1) In the case of AWD vehicles, install a spare fuse with the FWD connector in the engine compartment to simulate FWD vehicles.





2) Connect diagnosis terminals to 3 terminals (K) and 6 terminals (L) of the diagnosis connector beside driver seat heater unit.





3) Set the front wheels or rear wheels on the brake tester and set the select lever's position at "neutral".
4) Operate the brake tester.
5) Perform sequence control.
(1) Turn ignition switch ON.
(2) The ABS warning light comes on.
(3) Depress the brake pedal within 0.5 seconds after the warning light goes out so that the brake tester registers a pressure equal to the initial value.

CAUTION: Do not depress the clutch pedal.

NOTE: The engine must not be operating.

6) Hydraulic unit begins to work; and check the following working sequence.
(1) The left front wheel performs decompression, holding, and compression in sequence, and subsequently the right front wheel repeals the cycle.
(2) Simultaneously both right and left rear wheel perform decompression, holding, and compression in sequence.





7) Read values indicated on the brake tester and check it the fluctuation of values, when decompressed and compressed, meet the standard values.





- In case of hydraulic unit plunger piston malfunction:
8) After checking, also check if any irregular brake pedal tightness is felt.
9) In case of AWD vehicles, remove the spare fuse from the FWD connector in the engine compartment to return to the original AWD state.