2001 GMC Sierra 2500 HD Q&A

2001 GMC Sierra 2500 HD Question: Tires locking up

As I am driving there is a bang (maybe truck is trying to switch into 4wd) and all 4 tires are locking up. I put a new transfer case in last year. Any ideas? -
Answer 1
it is the Ebrake on rear end mine just went out it explodes,clean out pieces and you will have to replace a seal I just went around it and still have 3 brakes working -