michaeldavis39 Posted September 11, 2019 Report Share Posted September 11, 2019 Would it be beneficial to fit a non return valve to the TR6 brake servo - I ask as I have seen one fitted to a TR6 for sale and looking at the ebay linked advert below it mentions Pi model cars - what do you guys think? https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F254353398274 Thanks in advance Michael Quote Link to post Share on other sites
Richard71 Posted September 11, 2019 Report Share Posted September 11, 2019 Hi Michael, I thought they were standard fitment? The valve in your link is what I have fitted having given up on the type that screws into the throttle body (Land Rover part I believe), this gave a loud "tapping ticking" noise though the induction tract due to a weak spring. I have an aftermarket brake servo and couldn't find a non return valve of the correct size to fit directly into the servo body, so the inline version in your link is/was the perfect solution. Richard. Quote Link to post Share on other sites
michaeldavis39 Posted September 11, 2019 Author Report Share Posted September 11, 2019 I can't say I have seen a non return valve in any Tr6 parts diagrams hence my question, perhaps others on this forum will be able to share their knowledge on this. Thanks Richard. Michael Quote Link to post Share on other sites
Waldi Posted September 11, 2019 Report Share Posted September 11, 2019 The TR6 servo has a NRV as standard fitted. The servo should hold vacuum after the engine is switched off. Regards, Waldi Quote Link to post Share on other sites
ed_h Posted September 11, 2019 Report Share Posted September 11, 2019 Yes--the stock hose connector has an internal check valve. I verified it's operation when I did my servo. Ed Quote Link to post Share on other sites
michaeldavis39 Posted September 11, 2019 Author Report Share Posted September 11, 2019 Thank you so no point in adding another nrv to the servo, perhaps the TR6 I saw for sale had a failed servo and had an extra nrv fitted to compensate?? Michael Quote Link to post Share on other sites
Richard71 Posted September 11, 2019 Report Share Posted September 11, 2019 4 minutes ago, michaeldavis39 said: Thank you so no point in adding another nrv to the servo, perhaps the TR6 I saw for sale had a failed servo and had an extra nrv fitted to compensate?? Michael Maybe the seller just had the same problem I had? Richard. Quote Link to post Share on other sites
Waldi Posted September 11, 2019 Report Share Posted September 11, 2019 Hi Michael, adding an additional NRV will reduce the efficiency of the servo, as each NRV restricts the flow and reduces the vacuum since it has a spring load that results in a pressure drop (well, rise in the case of a servo). Waldi Quote Link to post Share on other sites
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