My Willys 3A and 3B Community

TECH FAQ SECTIONS => Chassis, brakes and suspension. => Topic started by: Patrick on December 07, 2022, 11:49:52 PM

Title: Brake Line size
Post by: Patrick on December 07, 2022, 11:49:52 PM

I am working on a 54' 3B that has been upgraded to the 11 inch drum brakes. Do the original brake lines need to be bigger or will the stock factory lines with original master cylinder work?

Title: Re: Brake Line size
Post by: Mark W. on December 08, 2022, 04:22:52 AM

Stock 3/16" line will work just fine. I have them on my 2A with 11" brakes and it will put the passenger through the windshield if not wearing a seatbelt.

Title: Re: Brake Line size
Post by: Rus Curtis on December 08, 2022, 10:23:03 AM

I agree with Mark.  I suppose you could find multiple sizes available at parts stores, but 3/16" is what I have.  It matches what I took off.

In my Parts Manual, GROUP 24-07 - Brake Tubes - Hydraulic, 

it indicates sizes for the brake line clips that secure the tubes but not specifically the size of the tubes (brake lines).  3/16" for clips to secure to the frame but 1/4" and 5/16" clips for the axles.  Keep in mind that those brake tubes have protective welting on them making their diameter larger.

From Buddy Wade's '55 (on the 3B Page):
(https://cj3b.info/Photos/Owners/Wade/CurtisPhotos/BrakeLineFrontDiff.JPG)
(https://cj3b.info/Photos/Owners/Wade/CurtisPhotos/FrameTopFrontLeft.JPG)

Title: Re: Brake Line size
Post by: Patrick on December 08, 2022, 03:43:37 PM

Thanks Guys. I couldn't find a definitive answer on the web. I appreciate it.