The power brake booster pump is an essential part of the braking system that allows the brakes to be activated in a split second when the pedal is pushed by supporting the hydraulic brake system of the vehicle in creating pressure to make the vehicle stop. Fits the Following: 2008-2014 CTS 2008-2011 STS 2010-2015 Camaro 2016-2017 Caprice 2008-2010 HHR 2007-2009 Solstice 2007-2010 Sky Replacement part number: 20804130, 20939309, 31317530, 9428081, 20914523, 178-0884, 20997418, 009428-08, 26110FJ00 This is a compatible replacement part manufactured by AA Ignition. This power brake booster auxiliary pump is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this electric brake vacuum pump fits.