Stats: 1993 Pontiac Funbird
Rear drums, four wheel anti-lock
Pedal feels firm
Shoes are at most 1/2 worn.
When inspecting brake internals, everything appears fine.

The blue bomber has developed an interesting braking issue (at least its interesting to me). The rear pass. drum locks up under moderate brake pedal pressure. I found a leaky wheel cylinder and assumed I had it solved.

Not so simple. So far I have:

1) Replaced the wheel cylinder. No change
2) Swapped drums from left to right. No change
3) Tightened both adjusters so the drums fit more snuggly over the pads. No dice.
4) For $hits, I disabled the anti-lock. You guessed it, locks up even better

So far, I've assumed the shoes are OK, but this evening I noticed that they're slightly more worn in the middle portions (both pass. and driver sides). I will replacing shoes tomorrow and I'll give both rear lines a good blead. But, pending no improvement, what else might it be.

Very curious, any ideas appreciated.

Dave M