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Home >> Kia >> 2012 >> Optima LX, Automatic Trans >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Disc Brake System - Except HEV >> Brake Booster >> Repair Procedures >> Inspection >> Vacuum Pump

Vacuum Pump

  1. Check the brake warning lamp in the IGN ON position.
    NOTE:

      Brake warning lamp is ON as below conditions.

    1. Parking brake warning
    2. Low brake fluid level warning
    3. Low brake vacuum pressure warning
      • Vacuum pump is abnormal condition
      • Vacuum pump CAN communication is abnormal condition
      • Vacuum switch is abnormal condition
  2. Check that the brake warning lamp is ON after the release the parking brake with a sufficient brake fluid level. If the brake warning lamp is ON, check the below points.
    1. Is the brake warning lamp ON within 5 seconds after IGN ON? (CAN Timeout Error)
      NOTE:

      CAN Timeout Error ; The brake warning lamp is ON when the communication fails more than 2 seconds between vacuum pump and cluster.

      Yes Reinstall the vacuum pump connector after removing it. And if the brake warning lamp is ON within 5 seconds after IGN ON, replace the vacuum pump.
      No Go to Step 2).
    2. Is the brake warning lamp ON within 45 ~ 55 seconds?
      Yes Brake vacuum switch is normal condition.
      No Go to Step 3).
    3. Is the brake warning lamp ON within 15 ~ 35 seconds after removing the vacuum hose from the brake booster?
      Yes Replace the vacuum pump.
      No Vacuum pump is normal condition.
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