SO I did new rear drum brakes on my 99 suburban.
My question is simple...how do i adjust them?

Old school way was to back up several times and they adjusted, does that still apply or do they adjust under normal driving?

 

Using the parking brake is how they are adjusted...Regular use of the parking brake will keep them adjusted..

 

Woud it be worth while taking the wheels and drums off and setting it up "close" manually or will they adjust pretty quick simply werking the Ebrake while sitting in the driveway? ?

 

Sure that would work, but if you have the knock out port just remove the rubber plug and adjust with a flat blade screw driver...