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GMC 1500 6.5l rear brakes question

C

Cody204

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I somehow got a hole in my rear brake lines but when I went to buy new ones they told me 3/8" x24 thread and 3/16 tube size but I thought it looked quite small soo I went out and checked and well a 9/16 wrench fits. I guess my question is why are they different and where would I buy them? everywhere I look it says 3/8" x24 thread and 3/16 tube size any help would be awesome iv searched and came up with nothing

truck specs
1995 gmc sierra 1500 sle 6.5l diesel 4x4
as far as I know its stock has 400km tranny was rebuilt from previous owner runs awesome
I think 14 bolt semi floater it has c clips drums 11-5"
 
Rear axle lines? Or the rear frame run?

3/8 24 refers to the flare nut THREAD. Rear axle lines (tubes) are 3/16" in diameter..
 
haha dam I knew I forgot something its rear passenger side if that matter. So what your saying is the 3/8 thread has a 9/16 head? To me that's kinda odd no? When I went to Canadian tire what the guy showed me witch was 3/8" x24 thread and 3/16 tube size it was way small compared to mine
 
haha dam I knew I forgot something its rear axle passenger side if that matter. So what your saying is the 3/8 thread has a 9/16 head? To me that's kinda odd no? When I went to Canadian tire what the guy showed me witch was 3/8" x24 thread and 3/16 tube size it was way small compared to mine
 
GM used an oversize flare nut. Typically 3/16 brake line flare nuts in the aftermarket is 3/8 hex or wrench size. Your tube size should be 3/16...
 
I knew it was something simple iv never seen that but then again only other vehicle iv worked on is a jeep cherokee oh well learnt something new and ya tubing does look like 3/16 those ribs things thru me off they were full of dirt anyways thanks a lot ill go pick it up tomorrow
 
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