General - One-way valve in VNT / EGR vacuum system: why?

craigv60 · May 4th, 2012, 11:45

Hi,

currently running & enjoying a V60 D3. This, and my last two diesels (Passat and Mondeo) have all had a one-way valve in the VNT / EGR vacuum system.

They're usually fitted in the main hose that runs from the vac pump to the VNT / EGR solenoid.

Anyone know why these one-way valves are there? Is it to ensure a problem in the 'engine' side of the vacuum system won't affect the brake servo assistance?

cheers, Craig

5cilinder · May 7th, 2012, 18:11

Probably
but it wont prevent all problems
For example if you have a leak and the vacuumpump can still create some pressure difference than it wont be shut of by the valve

May 4th, 2012, 11:45	#1
craigv60 Master Member Last Online: Dec 28th, 2022 17:28 Join Date: Jul 2011 Location: Macclesfield	One-way valve in VNT / EGR vacuum system: why? Hi, currently running & enjoying a V60 D3. This, and my last two diesels (Passat and Mondeo) have all had a one-way valve in the VNT / EGR vacuum system. They're usually fitted in the main hose that runs from the vac pump to the VNT / EGR solenoid. Anyone know why these one-way valves are there? Is it to ensure a problem in the 'engine' side of the vacuum system won't affect the brake servo assistance? cheers, Craig

May 7th, 2012, 18:11	#2
5cilinder Premier Member Last Online: Yesterday 17:35 Join Date: Oct 2011 Location: Groningen	Probably but it wont prevent all problems For example if you have a leak and the vacuumpump can still create some pressure difference than it wont be shut of by the valve

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