The vacuum servo in the engine bay is usually the cause, the seal on this item, which looks like a round Accordion, is leaking. To fix, put a plastic tie around each end so that the rubber is held snug to the two end plates.
If a leak was the issue this will fix it.
I need to see a picture and installation instructions of a 1986 Jaguar compressor
Russian cruiser Marshal Ustinov was created in 1986.
4.0 litre
The fuse for the window controls on a 1986 Jaguar XJ6 is in the passenger compartment fuse box. It is in the second row down and the fourth fuse from the right in the fuse panel.
$230.99 in my zip 76063
4.2 litre straight six.
To much for anyone who wants to know.
I believe it is 36 psi. Beez in Delaware
Working Designs was created in 1986.
About 280bhp (claimed). More like 250 in reality
It's in the trunk behind the spare inside the tank.
Beyond Our Control ended in 1986.