Jocko_51_B3B Posted November 20, 2018 Report Share Posted November 20, 2018 (edited) Anyone positively know of a source for these adapters? Asking around at auto parts stores is a waste of time. The ones I have from my old cylinders are probably reusable, but I would like to replace them with new ones if I can locate a source. Edited November 20, 2018 by Jocko_51_B3B Quote Link to comment Share on other sites More sharing options...
stylesadamson Posted November 20, 2018 Report Share Posted November 20, 2018 Advance auto parts on the rack Quote Link to comment Share on other sites More sharing options...
Jocko_51_B3B Posted November 22, 2018 Author Report Share Posted November 22, 2018 (edited) I ordered a couple of Dorman 788-516D adapters from O'Reilly's, but there are a couple of problems with them. The male thread pitch on the Dormans is correct at 20 t.p.i., but the thread O.D. is 1/2'' instead of 7/16" which is too large for the tapped hole in the rear brake cylinders. Also, the hex nut is too large to fit through the rear backing plate. The original fitting's hex nut fits a 5/8" wrench. If the hex nut is larger than 5/8", then the fitting will interfere with the backing plate. The older fittings in the photos (my originals) are really what's needed, but finding new ones is turning out to be hard if not impossible. The closest I've found are Edelman 265400 which have the correct male and female threads, but again, the hex nut is too large for the backing plate hole. Dorman male thread diameter too large. Dorman hex is too large to fit through backing plate. Edited November 22, 2018 by Jocko_51_B3B Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted November 22, 2018 Report Share Posted November 22, 2018 7/16 X 20 would be an SAE Boss thread, 1/4” ( - 4 ) size. So it would appear that you need an SAE - 4 male X 1/4” Inverted flare female fitting. Happy hunting. Quote Link to comment Share on other sites More sharing options...
squirebill Posted November 25, 2018 Report Share Posted November 25, 2018 I used the Edelman part number you found. Enlarged the hole through the backing with a plumber's taper reamer. Don't forget there is a copper crush washer used between the adaptor fitting and the wheel cylinder. Regards. Quote Link to comment Share on other sites More sharing options...
stylesadamson Posted November 27, 2018 Report Share Posted November 27, 2018 totally forgot that I cut new 7/16 threads on the Dorman piece Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.