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Hey team, I have a 99 Infiniti QX4, 4x4 w/ electronic transfer case. So for about two months I've had an intermittent "hissing" sound come from the under the dash, near the brake pedal during cold starts and occasionally while driving. The sound goes away as soon as the brake pedal is pressed lightly. The sound sometimes is heard while driving (but much less often than on the cold start), and will also go away when the brake pedal is pressed lightly. After reading a few forum threads, it sounds like there is a potential vacuum leak in the Brake Booster and/or valve nearby the brake booster, or that the booster is starting to fail. All the forums I came across did not have conclusive threads as to what fixed the issue so here I am asking you all what I should check first and if you all have any recommendations. Brake function has not changed since I began hearing this sound, the brake pedal seems to work the same as it did before with no loss of braking power or pedal play changes. Please let me know what you think! All information is appreciated and accepted. Thanks team!