Hi,
I attached the vacuum schematic for the evaporative emission system (pics 1 and 2).
Pic 3 shows the vacuum supply to the vacuum brake booster.
Can you tell approximately where the noise is coming from? Also, let me know what is happening with the brake booster.
Take care,
Joe
See pic below.
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Thursday, June 1st, 2023 AT 9:14 PM