you know what, thinking back to my wife's 93 yj, hers didn't have one under the battery tray. i had to rerun all her 4x4 vacuum lines and they went straight from the t-case switch to the front axle, not to a reservoir like my 87 has
I don't feel like working on anything, at this time.
Although the reservior isn't essential for it to run it does make things like the heat and 4wd work with less glitches.
If you already did a manual disco and don't mind if the heat shifts around at WOT then by all means get rid of it.
But they weigh like a pound, have no moving parts and you can use ANY vehicle make and model in the jeep. It's just a big airtight empty. TJs and ZJs have a flat one you can get at Morris's for less than $30 brand new.
Most vehicles will have a vacuum resevoir. Even diesels that have an electric motor to create vacuum will have one.
As mentioned, the resevoir makes all the vacuum operated devices work more efficiently. It also prevents a massive loss of vacuum in the motor when you turn something on that uses vacuum. Without the resevoir, your engine would run rich for a moment, essentially the equivalent of a vacuum leak. Think of your brake booster for example, which uses a lot of vacuum when you press the service brake.
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1, 5 Speed Peugeot, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
I thought that only one fresh air heater 'door' was vac operated; the rest are cable run. I was not planning on using any vac lines on my '91 as the front axle is going to be a cable posi-lock. Please tell me more...