Why does the vacuum booster one way valve have 2 inlets ???

[LongR]

This is off 1966 satellite 318ci

 

[HALIFAXHOPS]

I THINK the second one went to a vacuum canister on some cars

 

[pnora]

I THINK the second one went to a vacuum canister on some cars

Or a cruise control servo.

 

[azblackhemi]

I use it to hook up my vacuum gauge when tunning.

 

[R413]

It went to supply vacuum to the speed control. You don't use speed control and power brakes at the same time, the brake pedal cancels the speed control.

It does not go to and vacuum canister, they has a specific supply line.