Rear Brake Cylinder Brake Line Fittings

[Jocko_51_B3B]

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

[stylesadamson]

Advance auto parts on the rack

[Jocko_51_B3B]

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

[Merle Coggins]

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. 

[squirebill]

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.

[stylesadamson]

totally forgot that I cut new 7/16 threads on the Dorman piece