Another question from a newbie... I want to change out my old brake lines. I'm looking at a roll of copper-nickle alloy. Can someone tell me what the original brake line OD should be and what the brake line nuts should be?
Size of the brake lines depend on the year, Series, Make, Model and wheel cylinders of your truck. Most common brake line sizes are 1/8", 3/16" & 1/4", along with the corresponding double-flare nuts, which are matched to the wheel cylinder female brake line opening sizes.
Last edited by 4-5-6 Chevy Trucks; Wed Feb 29 2012 07:13 PM.
Almost everything before about 1960 was 1/4" lines. After that you start to see some 3/16" appear and with the advent of disk brakes, lots of 3/16" was used with special sized nuts on the master cylinder.
'38 Chevy 1-1/2 ton '49 Chevy 1/2 ton '54 Chevy 6400 2 ton '55.2 GMC 3/4 ton '56 GMC 1-ton