Hero is sb K 8

utg calls, button calls, hero completes, bb raises, utg calls, button calls, hero calls

Flop J 5 5 (4bb)

hero checks, bb bets, utg folds, button folds, hero calls

bad call here?

Turn 5 (6bb)

hero checks, bb checks

River Q (6bb)

hero?

bb was decent, his lowest raising hand would be KJ, 88. Somewhat passive.

Is this a bet/fold?

Does pot size ever have anything to do when picking to bet/fold?

If we check do we call a bet?

EDIT:
To clarify read, I don't think he would raise A10 and lower either

gonna go out on a limb...id bet/fold

Check/Call this.... WTF are you bet folding on? Let him bluff at it.

Well out of the range of hands I put him on, the only one I could beat was AK

Any pair or other hand he raises with he has a boat.

So there's definitely no reason to bet/fold. Given your read, his most likely hands given the turn check behind are AK, AQ, and KQ. There's more ways he could have AQ and KQ than AK, so you're more likely to be behind than ahead, thus you shouldn't value bet.

Either check/call or check/fold. Honestly, I think I would check/fold this, unless you believe he would bet with AK here.

I say he has AK and you check/call.

Don't fold this, and don't bet it.