The Stovebolt Site Forums The Parking Lot Big Bolts Brake hoses

I am currently replacing the brake hoses on my 1958 Chevy Viking 6500. It has dual wheel cylinders at each wheel. I have discovered that the original brake hoses,
both front and rear, are 3/16 id. The new replacement hoses are all 1/8 id. The front hoses are also 1 1/2 inches shorter than the originals. Not having a degree in fluid transfer engineering, I am concerned that he reduced inner diameter may adversely affect braking. Could volume and or pressure changes due to a 1/16 inch reduction in diameter cause a problem?

Thanks, Rich.

I am assuming you are talking about the rubber hoses, it should not make a big difference. Wheel cylinder or master cylinder diameter would though. I replaced all my lines and hoses, I used the same size steel lines but did not even think to look at ID on the rubber hoses.

Yes, I am referring to the rubber hoses. The part numbers for the hoses are UP36548 for the front and UP4000 for the rear. Does your 6400 take the same?

yes, I used the same rear (UP4000) but used UP25664 for the front. The only difference that I am aware of between 6400 and 6500 is frame length.

As a side note, you can get replace UP with BH and that is the Raybestos part # if you want to order from Rock Auto or somewhere else instead of Napa but check prices at both places. Napa was cheaper on the front hoses I think.

When I called Oreily's with the 36548 number it cross referenced to the 25664 number. They sell "Brake Stop" brand, which I have concluded is Raybestos. Which are less expensive at Oreily's.

I buy all my rubber hoses for all the old stuff I work on from a seller on eBay that is located in Argentina. To date, every hose I bought from them was a 100% exact fit replacement for whatever it was I had that was OEM. I have bought at least a half dozen sets of hoses from them for various types of antique, odd stuff. The seller's eBay ID is "luchonota".

Thanks for the lead. I will check out ebay for future projects. Unfortunately, I already purchased all three hoses from a shop that makes them. That's what prompted my question about inner diameter differences. The owner convinced me that the smaller inside diameter hoses would be ok. With four 1 1/8 wheel cylinders at the front and four 1 1/2 wheel cylinders in the rear I have a concern the brake fluid may be restricted returning to the master after pedal release.