Cruise control vacuum pipes?
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Three Wheeling
Joined: Sep 2012
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Cruise control vacuum pipes?
Hi - i have LH Drive V8. On the passenger side is the cruise control unit. There are 2 vacuum pipe spigots on the underside, one white and one black. Just one rotten piece of tube remained. I can find nothing going back to any point. I do have one vacuum tube coming of the brake servo which is continuous - no T points or joints. That runs to the top of the engine to draw vacuum pressure.
What do I need to run new tubing to please?
What do I need to run new tubing to please?
Camel Trophy
Joined: Nov 2015
Posts: 3,560
Likes: 834
From: Staten Island, NY
The cruise control unit is its own vacuum pump, so it doesn't need any connection to the engine vacuum.
As the diagram above shows, there should be two pipes associated with the unit: one loops around from the bottom where the vacuum is drawn to another port further up the unit, and the other goes to the bellows that pulls on the second throttle cable.
As the diagram above shows, there should be two pipes associated with the unit: one loops around from the bottom where the vacuum is drawn to another port further up the unit, and the other goes to the bellows that pulls on the second throttle cable.
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Three Wheeling
Joined: Sep 2012
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Thank you!
The cruise control unit is its own vacuum pump, so it doesn't need any connection to the engine vacuum.
As the diagram above shows, there should be two pipes associated with the unit: one loops around from the bottom where the vacuum is drawn to another port further up the unit, and the other goes to the bellows that pulls on the second throttle cable.
As the diagram above shows, there should be two pipes associated with the unit: one loops around from the bottom where the vacuum is drawn to another port further up the unit, and the other goes to the bellows that pulls on the second throttle cable.
I will get this done in the next week and report back! Just then got to get the aircon charged and the windscreen washer system feed replaced! And then there is repairing the ABS, again! Took the back seats out for room for camping with the dogs - up to Glacier Nat Park in August whilst there are still glaciers there!
Camel Trophy
Joined: Nov 2015
Posts: 3,560
Likes: 834
From: Staten Island, NY
You don't say the year of your D2, but my '99 does not have any vacuum lines going anywhere other than what I describe, and the cruise control works fine. I believe that the vacuum dump function formerly handled by the line to the brake pedal is now handled electronically.
From memory, there is a flanged port on the bottom of the cruise control unit that does NOT have a vacuum line on it -- it's a breather port.
From memory, there is a flanged port on the bottom of the cruise control unit that does NOT have a vacuum line on it -- it's a breather port.
Camel Trophy
Joined: Dec 2009
Posts: 3,883
Likes: 951
From: Charlotte
That's correct, no DII uses engine vacuum for cruise control.
The who's that failed on mine is the one that, as mollusk says, runs from the back of the bellows that pulls on the second throttle cable. It loops up and then down and then loops again underneath the unit to attach as shown in my pictures.
Two other short hoses, one from each of the white and black ports on the bottom of the unit, run to other ports next to the electrical connector, again as pictured.
The who's that failed on mine is the one that, as mollusk says, runs from the back of the bellows that pulls on the second throttle cable. It loops up and then down and then loops again underneath the unit to attach as shown in my pictures.
Two other short hoses, one from each of the white and black ports on the bottom of the unit, run to other ports next to the electrical connector, again as pictured.
Last edited by mln01; Jun 18, 2017 at 08:33 AM.
Old post bump...Patrick, did you ever get yours fixed? I bumped this thread because the other threads on this incorrectly talk about a vacuum line from the brake pedal...which doesn't exist.
I have same problems except my vacuum lines on the pump are not damaged.
I have same problems except my vacuum lines on the pump are not damaged.
2nd Gear
Joined: Jul 2012
Posts: 2
Likes: 0
That's correct, no DII uses engine vacuum for cruise control.
The who's that failed on mine is the one that, as mollusk says, runs from the back of the bellows that pulls on the second throttle cable. It loops up and then down and then loops again underneath the unit to attach as shown in my pictures.
Two other short hoses, one from each of the white and black ports on the bottom of the unit, run to other ports next to the electrical connector, again as pictured.
The who's that failed on mine is the one that, as mollusk says, runs from the back of the bellows that pulls on the second throttle cable. It loops up and then down and then loops again underneath the unit to attach as shown in my pictures.
Two other short hoses, one from each of the white and black ports on the bottom of the unit, run to other ports next to the electrical connector, again as pictured.
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