another 88 GTA 'brakes pull right' question

Hi,
My 88 GTA pulls to the right on braking. So far, I've put left and right front calipers on, and bled both front lines, but not the back. The guy
at the parts store said to just bleed the front lines since I am only doing the front calipers.
After doing the right fr caliper, no improvement. After doing the left fr caliper, I drove it for 5 minutes and noticed a big improvement : sometimes no pull to the right, once in a while an initial pull followed by a straightening. The NEXT day, I drove it again, and it pulls to the right just as badly as ever. !
Could it be there was some air still in the left front line, and it has moved to a "worse" spot by the second day, and is now having a greater effect? Grasping at straws.
No need to bleed the rear lines , right ?
Thanks,
L
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the proportioning valve could be plugged

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Ditto.
Original poster: Stop messing around. Throw out anything questionable in the braking system. This includes both flex hoses and calipers.
If this were my car ANYTHING that looked suspect would be tossed. Brakes are not something to gamble with.
Bleed the ENTIRE system and change the parts we noted earlier.
Now tell us what you've got. Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 26k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 141k and still going.... '80 T/A project car...
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Never pinch pennies on brakes. Always get the best of everything you can get your hands on. Your brakes only have to save your life one time to get your moneys worth.
Gary

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