Berlingo van

[Richard darcy]

Help im at the end of the road my 15 van has been to 4 diffrent mechanins n no one can fix it

[Richard darcy]

It gos fine for 15 km when i brake n slow down there a knoking from engine when i swith off n leave for a while it stops

[Gadgetman]

Sit DOWN!
Have a cup of tea and relax!

Now, take a good look at your van, and note which model you have.
There's a subforum for issues for each model.

Create a post there, and explain which engine you have, how old it is, how many miles/Kms it has driven, and if it has had regular services.

THEN you can describe the issue, using proper punctuation so that we can properly understand the issue.
You can also write what the garages have done... and if any of those are affiliatd with Citröen or have the correct diagnostics tools.