will drums make a boom sound when you romp on ur brakes if there not working properly in the rear?

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87 d150 2bbl carb 225
79 f250 300 v8
97 cavalier z24
83 f150 straight 6
89 f450 diseal 4x4 dually 5sp

If they arent adjusted properly you would more likely hear a slapping sound when the shoe hit the drum.

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its not on a a body or anything that old just a cavalier i thought you guys would know better then any body but if i romp on the brakes to hard it results in a loud bang sound it doesn't feel as if the rear brakes work

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87 d150 2bbl carb 225
79 f250 300 v8
97 cavalier z24
83 f150 straight 6
89 f450 diseal 4x4 dually 5sp

When I've heard sounds like that, something was broken allowing movement of the axle, drum w.r.t. the axle or the drum had warped and was not round anymore.

First, I'd check that drum is round - put the parking brake barely on, just enough for a tiny drag, then turn the wheel and see if it's constant through a turn. If that's OK,
I'd look for a cracked U-bolt, spring plate, shock mount, shoe nail, parking brake strut, etc.

i have a feeling it was the exaust system i clamped that up real good but it still does it if i slam on the brakes reaall hard

_________________
87 d150 2bbl carb 225
79 f250 300 v8
97 cavalier z24
83 f150 straight 6
89 f450 diseal 4x4 dually 5sp