Vacuum Hose Check Valve Inspection (Power Brake Unit)
WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the clamps and vacuum hose.
- Apply both suction and pressure to the engine-side hose, and verify that air blows only toward that side.
- If air flows in both directions or not at all, replace the vacuum hose.
Courtesy of MAZDA MOTORS CORP.