vacuum resevoir
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From: Fayetteville, GA
vacuum resevoir
yesterday while I was having my grill shell pulled off of a parts truck and I noticed that the truck ahd 2 vacuum canisters on it. one was a plastic ball style and the other was a coffee can style mounted under the fender in teh wheel well. the plastic one was mounted on top of the fender in the engine compartment. I was wondering why this truck has 2 and would it be best for me to steal both or is the coffee can one enough, being that my truck doesn't have one and I would like to have some assist on the brakes when I am stopping and the engine is idling. how would be the best way to plum one in to the system? is that the factory location for that coffee can style? ( I'm gonna mount it there on mine anyways, just wondering.)
More Turbo
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From: Colstrip, MT
That is the factory location for one of the canisters. There could have been as many as three vacuum canisters. One would have been located on a piece of sheet metal next to the battery for emissions requirements. If you don't want one of them, I will take it. PM me if you are interested.
More Turbo
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From: Wichita, KS
This information isn't specific to your truck, because I'm not that familiar with that year range. But, my '89 has 2 - one for emissions relays/valves and one for the cruise control. The brake booster's body acts as a vacuum reservoir for the brakes.
To plumb a vacuum canister in, just put a check valve (if not already installed) on the line coming from the manifold and then either "T" off to the canister and the device using the vacuum or run the line directly into the canister and another line coming from the canister to the devices.
Dave
To plumb a vacuum canister in, just put a check valve (if not already installed) on the line coming from the manifold and then either "T" off to the canister and the device using the vacuum or run the line directly into the canister and another line coming from the canister to the devices.
Dave
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From: Fayetteville, GA
Originally Posted by fatherdoug
That is the factory location for one of the canisters. There could have been as many as three vacuum canisters. One would have been located on a piece of sheet metal next to the battery for emissions requirements. If you don't want one of them, I will take it. PM me if you are interested.
If I don't use it then I will have it for you.
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From: Fayetteville, GA
Originally Posted by whateg01
...The brake booster's body acts as a vacuum reservoir for the brakes...Dave
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They also mounted what to me looks like a JUICE CAN not coffee can to the side of the battery brace in 78's.
I have only ever seen ONE reservoir per vehicle.
The small round one was usually installed in cars.
The metal ones do leak eventually so it looks like a P/O just installed another one.
Make sure all vacuum lines and parts don't leak.
I have only ever seen ONE reservoir per vehicle.
The small round one was usually installed in cars.
The metal ones do leak eventually so it looks like a P/O just installed another one.
Make sure all vacuum lines and parts don't leak.
More Turbo
Joined: Jan 2007
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From: Wichita, KS
I don't know if you are restoring a truck and need it to look stock, or just need the additional vacuum, but...
When the vacuum reservoirs rusted out on my truck, I got a couple feet of 4" exhaust tubing and welded a cap on each end. Then attached a 3/16" barb fitting for the vacuum line.
Dave
When the vacuum reservoirs rusted out on my truck, I got a couple feet of 4" exhaust tubing and welded a cap on each end. Then attached a 3/16" barb fitting for the vacuum line.
Dave
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More Turbo
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From: Colstrip, MT
I have two on my '78, and it looks like a third one was removed. I have a pint size can next to the servo for the cruise control. I also have one underneath the driver's fenderwell, and there is a connection next to the battery for a third one which was removed at one time. I know it was there, because you can see where the retainer for the can was spread to remove it.
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Last edited by monsterbaby; Aug 29, 2007 at 11:33 AM. Reason: turn overly large image to link
More Turbo
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From: Colstrip, MT
Dennis, I guess what I meant to say is that there are three vacuum reservoirs, each of which perform a separate function. One for the cruise control, one for the heat/ac controls, and one for emissions requirements.
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From: Fayetteville, GA
could it be that mine didn't come with one from the factory since it doesn't have any emmisions stuff on it? I find it hard to think that someone would just take one of and not replace it if there wasn't another one.
