Brake lines

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Jdsfx1

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Can anyone confirm the brake line size on my 08 Yukon XL? I need to splice the two lines running from the ABS unit to the rear brakes. I searched this site and found several people saying they were 1/4” but, after laying out the $$ for 1/4” fittings and a 1/4” flaring tool, they are larger than 1/4” and tool and fittings are useless. Are they 7mm?
 
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Jdsfx1

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I should add that they measure .263 in diameter.
 

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