Impreza RS Coupe AWD F4-2.5L SOHC (1999)
NOTE: Wrap sealing tape around the pressure gauge.
4. Bleed air from the pressure gauges.
5. Perform ABS Sequence Control.
6. 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.
7. 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.
8. Remove pressure gauges from FL and FR caliper bodies.
9. Remove air bleeder screws from the RL and RR caliper bodies.
10. Connect the air bleeder screws to the FL and FR caliper bodies.
11. Connect two pressure gauges to the RL and RR caliper bodies.
12. Bleed air from the pressure gauges and the FL and FR caliper bodies.
13. Perform ABS Sequence Control.
14. When the hydraulic unit begins to work, at first the RR side performs decompression, holding, and compression, and then the RL side performs
decompression, holding, and compression.
15. Read values indicated on the pressure gauges and check if they meet the standard value.
16. After checking, remove the pressure gauges from caliper bodies.
17. Connect the air bleeder screws to RL and RR caliper bodies.
18. Bleed air from brake line.
Checking The Hydraulic Unit ABS Operation With Brake Tester
1. In the case of AWD AT vehicles, install a spare fuse with the FWD connector in the main fuse box to simulate FWD vehicles.
2. Prepare for operating ABS sequence control.
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 ABS Sequence Control.
6. Hydraulic unit begins to work; and check the following working sequence.
1) The FL wheel performs decompression, holding, and compression in sequence, and subsequently the FR wheel repeats the cycle.
2) The RR wheel performs decompression, holding, and compression in sequence' and subsequently the RL wheel repeats the cycle.
