Jerry-
What makes you think that air is pushed into the master? The booster is connected to the master thru a push rod..
The isn't anyway for air to be forced into the master cylinder.
Can you give anymore details?
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Had-94,96,98,99 Cobra Stang,99 Navigator,03 Expy, 05 H2
Have-08 Titan C/C,06 GCSRT-425FTLB & AWD, other junk..
Want-08 Viper, 06 M5 
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