Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLVEHICLE DYNAMICS CONTROL (VDC) SYSTEM (SERVICE INFORMATION)VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U)INSPECTIONCHECKING THE HYDRAULIC UNIT ABS OPERATION WITH THE BRAKE TESTER
2016 Subaru Legacy 2.5i
Checking The Hydraulic Unit Abs Operation With The Brake Tester
2016 Subaru Legacy 2.5iSECTION Checking The Hydraulic Unit Abs Operation With The Brake Tester
- Set wheels other than the one to measure on free rollers.
- Prepare for the ABS sequence control operation. < Ref. to ABS SEQUENCE CONTROL . >
- Set the front wheels or rear wheels on the brake tester and set the gear to neutral.
- Operate the brake tester.NOTE: When any wheel speed reaches 10 km/h (6.2 MPH), the ABS sequence control stops and ABS operation is returned to the normal control mode.
- Perform ABS sequence control. < Ref. to ABS SEQUENCE CONTROL . >
- When the hydraulic unit begins to work, check the following work sequence.
- The front LH wheel performs decompression, hold and compression in sequence, and subsequently the front RH wheel repeats the same cycle.
- The rear RH wheel performs decompression, hold and compression in sequence, and subsequently the rear LH wheel repeats the same cycle.
- Read values indicated on the brake tester and check if the fluctuation of the values between decompression and compression meets specification.
Inspection conditions Front wheel Rear wheel Initial value 1, 000 N (102 kgf, 225 lb) 1, 000 N (102 kgf, 225 lb) When depressurized 500 N (51 kgf, 112 lb) or less 500 N (51 kgf, 112 lb) or less When pressurized 1, 000 N (102 kgf, 225 lb) or more 1, 000 N (102 kgf, 225 lb) or more - After the inspection, depress the brake pedal and check that it is not abnormally hard, and tightness is normal.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.