6066 (1960-1966) GMC Truck Club

6066 (1960-1966) GMC Truck Club (https://6066gmcclub.com/index.php)
-   Wheels, Tires, Suspension and Brakes (https://6066gmcclub.com/forumdisplay.php?f=23)
-   -   brake line size (https://6066gmcclub.com/showthread.php?t=51899)

Pfroman January 2nd, 2026 06:27 PM

brake line size
 
Just curious-
I am in the middle of disc brake conversion and although every spec I can find calls out 3/16 lines, mine of course has 1/4" lines on the front-which I pulled out and bought new to replace. Having to use adapters at the wheels and prop valve on the fronts. Is/was this normal? I can say I believe the old is all original as it looks the age (and was a B*&#tch to get out).

Again, just curious if it came out of the factory that way.

Babydeuce January 3rd, 2026 04:44 AM

Re: brake line size
 
Drums will be 1/4" as the wheel cylinders require volume over pressure. Disks will be 3/16" as they need pressure over volume. I am currently running new lines on my 66 with 4 wheel disk conversion, lots of fun!


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