I have noises coming from the back end I think it has to do with the brakes. on 1991 Chevrolet Suburban 1500

It makes a loud noise.I think it's from the brakes. Can someone tell me pretty much what it could be and how much

Asked by for the 1991 Chevrolet Suburban 1500
what kind of noise,scrapping,grinding, growling,whinning,all of the above ???
It's grinding. not all the time ,but sometimes it makes that;s not costant
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You can get an estimate for brake repair here, but you'll need to have it looked at to determine exactly what needs to be repaired to really know what the cost will be.