Vacuum Hose (Check Valve) — Checking (Hyundai Tucson JM)

1. Disconnect the vacuum hose with built-in check valve (A) from the vacuum booster.



2. Start the engine at idle speed. A vacuum should be created in the hose. If this does not happen, this is a sign of a malfunction of the check valve. In this case, it is necessary to replace the vacuum hose with the check valve and check again.