By parking brake mechanism, I'm guessing you mean the internal adjuster. When you put those back in, did you adjust them out so that the shoes just barely tick/drag the drums when you spin the wheel by hand?

Did you replace the spring cups? This shouldn't create the symptoms you're experiencing, but it was the only problem I had doing my rear drums - the retaining cups were so hammered that one let the pin through and released the shoe a couple hundred miles after I put it back together.

Nick a brake cylinder putting it back together?

Stretch a spring (hard to do but nothing's impossible).

Any extra parts?

The order of your response makes me wonder:


You didn't bleed it first then replace the shoes?

Regardless, first thing I'd probably do it bleed about a whole quart bottle of brake fluid through it, then start taking it apart again if a bleed doesn't cure it.

Could it be up at the master cylinder? You kept it topped up while you bled it, yes, didn't let it run dry?

Your answers to some of these might be exasperated "Noooooooo"s, but as I run through it in my head they're what come to mind as simple oversights that might cause this.