Check Valve
NOTE:
On Festiva, check valve is pressed into hose. An arrow on hose indicates direction of vacuum flow.
On Capri, check valve is located on power brake unit. On Festiva, check valve is located in vacuum hose connecting power booster to intake manifold. Disconnect check valve vacuum hose from manifold. Alternately apply vacuum and pressure to hose. Ensure air flows only toward engine. If pressure by-passes check valve or if check valve blocks vacuum, replace hose and check valve.