When i turn left my 2004 Sierra 1500 makes a moaning/groaning noise. I feel a little vibration in the wheel. This is loudest at 10-30 mph. Any suggestions?
If you have a Hydro-boost System which i think you do, it sounds like your seal to the relief valve has gone bad and will need to be replaced. Here is some information that should help you.
F/CMVSS Noncompliance - Brake Hydro-Boost Relief Valve Seal Fracture #04004A - (Jun 18, 2004)
04004A - Brake Hydro-Boost Relief Valve Seal Fracture
2003-2004
Cadillac Escalade, Escalade EXT, Escalade ESV
2003-2004
Chevrolet Silverado, Avalanche, Suburban, Express
2004
Chevrolet Tahoe
2003-2004 GMC Sierra, Yukon, Yukon XL, Savana
2003-2004 HUMMER H2
Start with looking in to that to make sure that your brakes will not be the next thing to cause you issues.
Good luck and keep us posted.
