Brake?

[kustom71]

Hope this is the right place to ask this ?
It s my first
Hope someone can help
I have a 99 tahoe 5.7 vortec has about 130,000 on it and as of late I have noticed the brakes seem to be real touchy.
This only happens when the truck has sat for awhile
I will put my foot on the brake shift into gear and everything is fine but when I take my foot off then go to reappy the brakes its like they grab real quick and hard to the point that the rear brakes will lock up if its wet or on gravel?
This only happens like i said when It sits for a couple hours but not everytime it sits either.
It does stop doing this after I hit the brakes a couple times.
Any ideas it is driving me crazy?
Thanks

 

[fyremanpat]

sounds like they need to be re-adjusted or youve worn the rear shoes out.pull the rear drum off and take a look...my money is on worn out shoes