My brakes pull to the left hard - ideas?

[hotrodf1]

Hey all,

Just joined up and was happy to have found a place such as this for these ol trucks.

I just bought a 66 GMC that has been mostly gone through, but something is wrong with the brakes / suspension.

When I hit the brakes the truck pulls to the left. THe harder you brake the harder it pulls to the left. I found receipts where the brakes had been redone, but the note on the work order said something about pulling to the left under braking as well. Apparently the shop couldn't fix it either.

I replaced the shoes (replacing a perfectly good set) and found the wheel cyls in good shape.

I rebled all the lines, LR, RR, RF, LF, still no change.

If I slam on the brakes I think only the LF wheel locks up. THe brakes don't seem to have much grab - got to have a strong leg to stop.

The only thing I can think of is some trash in the lines or something. The brakes are so simple, what else could it be? Some of the lines have already been replaced, so maybe when they did that some trash or something got in there?

I want to drive this thing, but if I to hit the brakes hard, I don't think I coudl get her stopped in time.

Thanks for any help!