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I have bought this 08 Silverado LTZ used with about 60k on it about a year ago. The first month after i bought it i had a knocking sound from the rear of the truck. I took it in to the dealership and they couldn't find anything wrong but the lubed all the joints and said it was good to go. Well I serviced the the truck regularly since then and haven't had a problem till the beginning of December. the noise came back and i cant seem to find it. Every time I stop at a light / stop sign then go i get this knock or clunk like the transmission isn't fully in gear or the rear drums aren't releasing. i tried hard stops and easy long stops and either it does it. Could it be differential, drive shaft, rear drums, or transmission? they all look good and don't seem to be worn abnormally.

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Todd
 

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Just a guess, could it be the driveshaft slip yoke? I have seen them bind and you feel a clunk when you release the brake pedal after stopping. Also, if your truck is one of the longer wheelbase models, it may have a 2-piece driveshaft with a center support bearing. Sometimes the rubber insulator in the bearing assembly goes bad and causes a noise. Kind of doubt the master cylinder is causing a noise, but if it's bad you should change it as soon as possible.
 

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Is it 4WD?

I'm thinking driveline lash, my 2008 Sierra had a bit more than what I would define as normal, it would "clunk" a bit.

Yours might not be one specific thing, but the sum-total of all the driveline components.
 
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I have bought this 08 Silverado LTZ used with about 60k on it about a year ago. The first month after i bought it i had a knocking sound from the rear of the truck. I took it in to the dealership and they couldn't find anything wrong but the lubed all the joints and said it was good to go. Well I serviced the the truck regularly since then and haven't had a problem till the beginning of December. the noise came back and i cant seem to find it. Every time I stop at a light / stop sign then go i get this knock or clunk like the transmission isn't fully in gear or the rear drums aren't releasing. i tried hard stops and easy long stops and either it does it. Could it be differential, drive shaft, rear drums, or transmission? they all look good and don't seem to be worn abnormally.

Please Help
Todd
What your hearing is the rear driveshaft slip yoke going into the trans and when it slides on the splines you get the clunk sound, remove shaft and grease the inner splines on the shaft and outer splines on the trans shaft and the problem will be gone, very common problem that is a easy fix.

When you remove the driveshaft from the trans some fluid may come out on the tail shaft on the trans, no big deal.
 
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2wd you can lubricate the slip yoke. 2007 and newer 4x4 you cannot.
 
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