Brake Booster Vacuum Hose Functional Inspection

Test Procedure 

• Procedure
• • Turn the vehicle to the OFF (LOCK) mode.
  • Press the brake pedal several times to deplete the vacuum.
  • Press the brake pedal, and hold it, then start the engine.

• Normal Conditions
• • -

    Brake pedal sinks.

Results 

• If it is abnormal, there is a problem with the brake booster vacuum hose.
• If the symptom/DTC goes away, the brake booster pressure sensor must be faulty.