Hissing sound from brake pedal?

ICE

New member
95 GM Yukon -Hissing sound when I'm at a stoplight with my foot on the brake. Only happens sometimes, usually after driving for a few minutes.

Years ago the master cylinder was cracked, and was leaking into the brake booster -or the other way around, I forget, but I had to have them BOTH replaced and it was like 3k. I can't do that again. Any ideas? thanks.
 
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