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at the vacuum hose diagram for the engine bay components....
Vacuum source shows to be a Tee fitting spliced into the line that feeds the cabin air vent directors. The splice comes after the existng check valve.
From that point, the hose goes to the 2-unit area, and goes into another Tee.
From the tee, one line goes to the round-end vacuum reservoir, to the only nipple it has. The other line goes to the valve housing to a nipple marked "vacuum".
The valve housing has another nipple, marked "Servo" and the hose from it is the long one that goes into the cabin and connects up under the dash.
You asked how much vacuum is needed? That I never questioned. I just figured the system would work OK on the vacuum created by the engine. It works fine.
Hearing air released when you step on the brake pedal may mean nothing. I don't notice it, but my hearing isn't youthful anymore. There may be a sound like that from the brake booster, too.
If the cruise control works, then everything is OK. Otherwise, otherwise.
I use the CC pretty much every chance I get. Easier on the feet.
Good Luck,
Bob
:>)
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