Tires locking up on 2001 GMC Sierra 2500 HD

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?

by in Athens, NY on December 29, 2009
1 answer
ANSWER by on November 28, 2012
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

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