Brake booster vacuum lines.

[Greggory1]

I have a 1966 Lincoln Continental. I have two vacuum line that come off my brake booster. Does anyone have a drawing or can anyone tell me where they connect to. I found one dangling, and have a no idea where it came from are where it goes
Thanks
Gregg

[Dan Szwarc]

Big one to the intake manifold metal line on the drivers side. Pull the air cleaner to see it.

Little one goes to the transmission modulator. There should be a metal line at the top where the line connects. This metal like snakes around the RH side of the tranny and down to the bottom in the back where it connects to a ribber line that connects to the modulator (visible from underneath).

Check out this thread on the vacuum modulator:
https://www.thelincolnforum.net/phpbb3/ ... hp?t=54007

Note: the image in the linked thread is mirrored for your 66. Look closely at your car and you’ll see how it is.

[Greggory1]

Great!!! thanks for the help!!

[Dan Szwarc]

transmission vacuum line

Note the metal line at the bottom.

Booster line going to end of metal line at intake.

Heh. A little before and after restoration above.

[Lee]

I want to think that the engineers must have had a good reason to route the modulator vacuum that way, but for the life of me, I can't figure out what that was.

[TonyC]

Nor I, Lee. I find it rather stupid, considering that I happened along a much better routing. On Frankenstein, I have the modulator tapped to the vacuum-distro cluster over the intake. The smaller port in the booster valve is tapped to the parking brake. They both do the same things they're supposed to do, but the routing is less complicated.

---Tony

[Dan Szwarc]

The vacuum systems in the 66 (and all 61-69s Lincolns) seem like a hack of 6 different groups who all worked separately until it came time to integrate them into the engine bay and connect to the motor. It's a hodge-podge of add-ons, splitters, and ultimately poor design.

By 1970 (redesign time), they went to a vacuum tower manifold design with a label and colors for every connection. Unused ports are plugged and slightly varying sizes prevent incorrect connections. My 70 Mercury (carry-over from 69) has this same design.

1970 Marquis Vacuum Tower

Neater and way better than 1966.

And now back to our regular programming.

[frasern]

My gut tells me the design was intended to shave a quarter second off the assembly line. The tower saves even more time, so it became the norm.

[rick]

All of this information is why this Forum is the best Forum in the land.