Impreza WRX F4-2.0L DOHC Turbo (2004)
8) Remove the pressure gauges from FL and FR caliper bodies.
9) Remove the 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 the 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 the 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 the brake line.
CHECKING THE HYDRAULIC UNIT ABS OPERATION WITH BRAKE TESTER
1) In the case of AWD AT Non-turbo vehicles, install a spare fuse with the FWD connector in the main fuse box to simulate FWD vehicles.
2) Prepare for operating the 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.
