Checking The Hydraulic Unit Abs Operation With Brake Tester

In the case of AWD AT model, install a spare fuse with the FWD connector in the main fuse box to simulate FWD model.

Fig 1: Identifying Main Fuse Box And FWD Connector
Courtesy of SUBARU OF AMERICA, INC.

NOTE: The AWD circuit of MT model can not be disabled because viscous coupling is used inside center differential.
Prepare for operating the ABS sequence control. < Ref. to ABS SEQUENCE CONTROL . >
Set the front wheels or rear wheels on the brake tester and set the select lever's position at "N" range.

Fig 2: Setting The Front Wheels Or Rear Wheels On The Brake Tester
Courtesy of SUBARU OF AMERICA, INC.
Operate the brake tester.
Perform the ABS sequence control. < Ref. to ABS SEQUENCE CONTROL . >
Hydraulic unit begins to work; and check the following working sequence.
1. The FL side performs decompression, holding and compression in sequence, and subsequently the FR side repeats the cycle.
2. The RR side performs decompression, holding and compression in sequence, and subsequently the RL side repeats the cycle.
Read values indicated on the brake tester and check if the fluctuation of values, while decompressed and compressed, meet the standard values.

Fig 3: Front And Rear Wheel Specification Chart
Courtesy of SUBARU OF AMERICA, INC.
After checking, also check if any irregular brake pedal tightness is felt.