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Brakes pulling to the left bad after replacing all the calipers with loaded rebuilt ones, even replaced the cross over line to the distribution block under the master cylinder. PITA.
Got to thinking about the rebuilt calipers, Advance auto didn't have one of them and had to go to Oreilly for the other one. Pulled the front pads to check them out and found a difference in the pads from the two suppliers ( thanks to forum member 73LS1 for a set of spare front pads ).
After 2-3 stops the Advance pad was working better than the Oreilly pad and would grab better and pull to the left.
Moral of the story, dont mix and match brake parts.