93 Grand Am ABS

My 93 Grand Am has come up with a problem of, when I first start the auto after setting either all day or over night, that the rear brakes want to grab and lock.
By the time I get to the end of my driveway, the brakes are working normal ( as far as I can tell ), and will even contunie to work as normal after brief shutoffs. It is only after long periods on engine shut off that the problem acures.
What might be my problem?

Rear drum? If so pull the drums and sand the shoes with some emery cloth.

Try that, but moisture can cause your problem too. That's "normal" for drum brakes... so unless a few grabs are unacceptable to you, just live with it. It's not an ABS issue, and there's no danger of the brakes not working. I've just always lived with it on my vehicles (or converted them to disc :))

But you are all failing to understand the problem,,,,, there are no front brakes for the beginning of it and the back ones do more than crab....... just tap they brake and they LOCK UP and SLIDE THE TIRES

It is a common problem Kenny58!

The only thing to realy do is inspect the rear brakes and make sure all the components are working properly.

Then you could drain all of your old brake fluid inthe system, and fill it with new brake fluid, moisture and corrosion in the lines/system effect your brake pressure and part of the culprit.

Also the drums get a small amount of rust overnight and cause them to be a little more grabby.

Do a search in the GA forums, you will see that thiers many people with the same issue(s) with rear drums.

I understand completely! Sand the rear shoes with some emery cloth. Sounds like they might be adjusted up a little high as well. The emery cloth will remove the glaze from the shoes. This works about 99% of the time!!

Of course like mention above if there is an abvious problem found upon inspection you will need to correct that first.

Yeah the light sanding could help, might hit the drum surfaces they tend to glaze over too.