Checking The Hydraulic Unit Abs Operation With Brake Tester

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

Fig 1: Installing Spare Fuse With FWD Connector In Main Fuse Box
Courtesy of SUBARU OF AMERICA, INC.

NOTE: The AWD circuit of MT vehicles can not be disabled because viscous coupling is used inside center differential.
Prepare for operating the ABS sequence control.
Refer 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: Checking Front Wheels On Brake Tester
Courtesy of SUBARU OF AMERICA, INC.

Fig 3: Checking Rear Wheels On Brake Tester
Courtesy of SUBARU OF AMERICA, INC.
Operate the brake tester.
Perform the ABS sequence control.
Refer to ABS SEQUENCE CONTROL .
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.
Read values indicated on the brake tester and check if the fluctuation of values, when decompressed and compressed, meet the standard values.

Fig 4: Checking Fluctuation Values When Decompressed & Compressed
Courtesy of SUBARU OF AMERICA, INC.
After checking, also check if any irregular brake pedal tightness is felt.