On GM vehicles the line that runs to the rear brakes is usually 1/4 inch, and the front lines are usually 3/16 inch. Thats not a hard, and fast rule, but more times than not that's what sizes GM used.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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