Power Brake Booster. 2007 Chevrolet Silverado 1500 Classic Hybrid/LS/LT/SS/WT 4.3L, 4.8L, 5.3L, 6.0L. 2005-2006 GMC Sierra 1500 Base/Denali/Hybrid/SLE/SLT/WT/SL 4.3L, 4.8L, 5.3L, 6.0L. 2007 GMC Sierra 1500 Classic Denali/Hybrid/SL/SLE/SLT/WT 4.3L, 4.8L, 5.3L, 6.0L.
