Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Chevrolet for this TSB. Call your local Chevrolet dealer's service department & ask for a copy of TSB# 000523006.
Affected Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC
SOME VEHICLES BUILT PRIOR TO VIN BREAKPOINT 19117621 MAY EXHBIT AN AUDIBLE GROAN / SQUEAL TYPE NOISE COMING FROM THE REAR OF THE VEHICLE DURING A LIGHT BRAKE APPLY. *TT