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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Brake Control System (VDC - Diagnostic Trouble Codes (DTCS) Symptom Tests And Component R&R) (Exc Hybrid) >> Symptom Diagnosis >> Unexpected Brake Pedal Reaction >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

  1. CHECK FRONT AND REAR AXLE

    Check that there is no excessive looseness in front and rear axle.

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair / replace error-detecting of front or rear axle part.

  2. CHECK DISC ROTOR

    Check disc rotor runout.

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Refinish the disc rotor.

  3. CHECK BRAKE FLUID LEAKAGE

    Check fluid leakage.

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair / replace fluid leakage part.

  4. CHECK BRAKE PEDAL

    Check each item of brake pedal. Refer to INSPECTION AND ADJUSTMENT .

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Adjust each item of brake pedal. Refer to INSPECTION AND ADJUSTMENT .

  5. CHECK BRAKING FORCE

    Check brake force using a brake tester.

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Check each components of brake system.

  6. CHECK BRAKE PERFORMANCE

    Disconnect ABS actuator and electric unit (control unit) connector so that ABS does not operate. Check that brake force is normal in this condition. Connect harness connectors after checking.

    Is the inspection result normal?

    YES 

    Normal

    NO 

    Check each components of brake system.