Vacuum Loss Function Inspection

WARNING: This page is about a different car, the 2007 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

Start the engine.
Depress the pedal with normal force.
With the pedal depressed, stop the engine.
Maintain the pedal depressed for approx. 30 s .
If the pedal height does not change during this time, the unit is normal.