Pete Lewis Posted July 31, 2021 Report Share Posted July 31, 2021 i said earlier there are two diameters as kevin suggested google there are plenty out there try this https://www.ebay.co.uk/itm/183906072383?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=183906072383&targetid=1280441980521&device=c&mktype=pla&googleloc=9046046&poi=&campaignid=12126078219&mkgroupid=120032726582&rlsatarget=pla-1280441980521&abcId=9300480&merchantid=101717694&gclid=EAIaIQobChMIteWRovSN8gIV0NPtCh3MdwACEAQYAiABEgKFQfD_BwE Link to comment Share on other sites More sharing options...
SpitFire6 Posted August 1, 2021 Report Share Posted August 1, 2021 On 30/07/2021 at 10:00, Pete Lewis said: no the shuttle should close off the pressure lost line as its moved across by the pressure difference to arrest any more fluid loss Pete Hi Pete, I believe you are wrong in your assumption. It does not function as you believe it does. When you understand how it functions, please let me know. Sincerely, Iain. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted August 1, 2021 Report Share Posted August 1, 2021 I've been doing a lot of reading on PDWAs due to this thread and never having had one actually fitted to a Triumph myself (I have rebuilt them, though) I can only go by what I've read - it seems there are certainly two types, one with two pistons and one with a single piston, but this post on another forum is interesting: The PDWA came in a number of different configurations. One of them has a set of sleeves that will slide with the piston during pressure imbalance, and almost completely blind the low pressure line. I have that PDWA on two of my 1980 Spitfires. This seems to point to a system that blanks off the side that is losing fluid; 90% of the other posts / forums and articles state that it's a warning system only, and all it does is activate the warning lamp. That one came from https://www.tapatalk.com/groups/spitfireinformationexchange/brake-master-and-pdwa-component-and-poor-brake-per-t4519.html Link to comment Share on other sites More sharing options...
DVD3500 Posted August 1, 2021 Report Share Posted August 1, 2021 Well I am picking up a US spec 1500 on Wednesday and I will be tearing it apart and I am planning on transplanting its braking system... I will take a good look at it... Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 1, 2021 Report Share Posted August 1, 2021 if it doesn't close the lost circuit its a waste of time never played or found one that does not protect the braking that left in all my years in manufacturing agree there are two designs i said that right at the beginning Pete 1 Link to comment Share on other sites More sharing options...
AlanT Posted August 2, 2021 Author Report Share Posted August 2, 2021 Well I’ve ordered new seals from simplybearings.co.uk As a late car mine has the two sleeves. Be good to get this right rather than bodge it since the entire braking system is being replaced +pretty much every other mech part on the car! 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 3, 2021 Report Share Posted August 3, 2021 im sure a good clean and new seals will be fine Pete Link to comment Share on other sites More sharing options...
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