They do run downhill. I removed the "U" section on the end of the hoses before extending them.
The way I figure it, If I get water to this point of the firewall for any length of time, I would be checking / changing the oils anyhow.
I have had bow waves up the the wipers plenty of times, but I think this area under the bonnet will be a somewhat air locked for short water crossings. It is during deep water crossings that diffs etc cool rapidly and suck in air.
Any other suggestions would be most welcome.
This is some generic info on the breathers used.
http://www.fabco-air.com/pdf/Sec_14.pdf
Erich
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