LEMON Manuals: Even more car manuals for everyone
Home >> Fiat >> 2017 >> 500 Lounge, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Base Brakes (Service Information) - 500 - Electric) >> Hydraulic/Mechanical >> Booster, Power Brake >> Diagnosis And Testing >> Master Cylinder/Power Booster >> Power Booster Vacuum Test

Power Booster Vacuum Test

WARNING: This page is about a different variant/trim than selected.
  1. Connect a vacuum gauge to the booster check valve with a short length of hose and T-fitting.
  2. Start and run the engine at curb idle for one minute.
  3. Observe the vacuum supply. If the vacuum supply is less than 12 inches HG (406 millibars), repair the vacuum supply.
  4. Clamp the hose shut between the intake vacuum source and the check valve.
  5. Stop the engine and observe the vacuum gauge.
  6. If the vacuum drops more than 1 inch HG (33 millibars) within 15 seconds, the booster diaphragm or check valve is faulty.
scientia non olet · About LEMON Manuals