31 LaSalle Posted July 20, 2023 Share Posted July 20, 2023 Does anybody know the size of the brake pipe that comes from the firewall mounted reservoir to the master cylinder on a 1928 Chrysler 72 it was missing when i got the car Link to comment Share on other sites More sharing options...
Gunsmoke Posted July 20, 2023 Share Posted July 20, 2023 Check size of fitting that connects to both ends, to reservoir and to master cylinder, measure required length and then go to a shop and buy a length of fitted brake line with those fittings, actual size may have been originally 1/8"-3/16", likely does not matter much as it is gravity fed. 1 Link to comment Share on other sites More sharing options...
31 LaSalle Posted July 20, 2023 Author Share Posted July 20, 2023 thank you GUNSMOKE for your reply the fitting size at the master cylinder and the reservoir is 7/16 unf 20 tpi the only fittings i can get are for 1/4 pipe i thought it would have to be larger because the feed pipes from master cylinder to brakes is 3/8 anyway i will use 1/4 pipe Link to comment Share on other sites More sharing options...
Gunsmoke Posted July 20, 2023 Share Posted July 20, 2023 1/4" will be fine, it is only intended as a low volume drip feed. The lines to the wheels cylinders are sized to deal with the pressure and volume required to actuate brake shoes, and to then quickly return fluid to master cylinder when brake pedal is released. Modern disc brakes often have very small brake lines to cylinders, maybe 1/8" in some cases, but operate under higher pressure of power brakes. 1 Link to comment Share on other sites More sharing options...
viv w Posted July 20, 2023 Share Posted July 20, 2023 Based on both my series G70 and my series 62 I'm pretty sure your model 72 will be the same. Pipe from the reservoir to master cyl will be 5/16. The pipes from the master cylinder to the T piece on the frame x member and from that T to the 2 T pieces on the side frame rails is 3/8 and the ones from the side rail t pieces to front and rear are 5/16. 1 Link to comment Share on other sites More sharing options...
pre1939chrysler Posted July 21, 2023 Share Posted July 21, 2023 I have acouple oftubes with fittings on my shelf with the correct bend and length. They aren't that expensive. If interested , email me at astheime@ptd.net or call 610 863-6955. I'll be glad to send pictures.Jay Link to comment Share on other sites More sharing options...
31 LaSalle Posted July 21, 2023 Author Share Posted July 21, 2023 12 hours ago, viv w said: Based on both my series G70 and my series 62 I'm pretty sure your model 72 will be the same. Pipe from the reservoir to master cyl will be 5/16. The pipes from the master cylinder to the T piece on the frame x member and from that T to the 2 T pieces on the side frame rails is 3/8 and the ones from the side rail t pieces to front and rear are 5/16. Just checked my brake pipes on my 72 and you are correct 3/8 and 5/16 . the pipe and fittings were missing from reservoir. when i got my car so dont know pipe size i suspect it was 5/16 anyway cant locate any fittings for 5/16 here in uk so as per GUNSMOKES advice will go with 1/4 pipe Link to comment Share on other sites More sharing options...
viv w Posted July 21, 2023 Share Posted July 21, 2023 If you go with 1/4 tube then you will have to find reducers etc. I suggest you get contact Jay above for your fittings, however, just remember your car is RHD so the pipe you need will be longer than the one for a LHD car, so measure the length you need. You may have to buy the fittings from Jay and make up a pipe the length that you want. 1 Link to comment Share on other sites More sharing options...
31 LaSalle Posted July 21, 2023 Author Share Posted July 21, 2023 4 hours ago, viv w said: If you go with 1/4 tube then you will have to find reducers etc. I suggest you get contact Jay above for your fittings, however, just remember your car is RHD so the pipe you need will be longer than the one for a LHD car, so measure the length you need. You may have to buy the fittings from Jay and make up a pipe the length that you want. HI VIV W have now managed to get two brass 7/16 unf fittings for 1/4 pipe nothing seems the same from model to model on these pre war chryslers ??? Link to comment Share on other sites More sharing options...
pre1939chrysler Posted July 23, 2023 Share Posted July 23, 2023 Remember, copper tubes single crimp, steel double crimp. No don't use steel on the down line. 1 Link to comment Share on other sites More sharing options...
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