how to adjust parking brake

Can anyone tell me how to adjust the parking brake? It looks like on the drivers side under the door there's a nut to turn but does it adjust for both sides at the same time? Also how much play is there supposed to be in the cable or pedal? How do you measure the play?

Thanks

There's an equalizer that creates even pressure on each wheel from that cable. Is the play side to side?

Year, make, model, disc, or drum brakes on the rear? The adjustment procedures are substantially different with drum and disc brakes.

Thanks guys for your post. I figured it out. The equalizer I couldn't get adjusted that much because it was rusted. I did heat it with a torch and managed to get it turned about 10 turns but that wasn't near enough. So below is what I did for anyone in the future that may have to do this.

I have a 98 blazer LT 4x4 with disc brakes in the rear but it has drum parking brakes. When you take the disc/drum off at the bottom of the drum shoes there is a little knurled wheel. If you turn that it will adjust the shoes out or in. I turned it until I couldn't get the drum back on, then backed it off 2 clicks. Stuck the drum back on and made sure i could turn it easily by hand (make sure it's in Netural). Applied the parking brake and released it and checked it again. Then did the other side and went on a gravel road and pressed the paarking brake all the way down and checked for even skid marks. Went for a 2 mile drive and got out to see if I could smell hot brakes... nada... so I think I have them adjusted correctly now. I can also no longer press the pedal all the way to the floor.