I'm in the process of buying an 05 deisel turbo vito off a freind and, in accordance with sod's law, it's developed an unusual squeak - when I'm in third gear going down a slight incline, if I take my foot off the accelerator ( using engine brake as it were ) you can hear a very audible squealing noise. it doesn't seem to make the noise if you repeat the proceedure in any other gear i.e. 2nd, 4th ,5th, etc. Does anybody have any idea what this may indicate? I have driven the van a lot through work, and it's never had any problems, but as soon as i decide to buy it, it starts making this mysterious bloody noise!