This is the power brake booster for 2009-2011 Cadillac DTS and Buick Lucerne vehicles. This is for those vehicles without heavy duty brakes, with front and rear disc brakes (JL9). This part mounts under the hood on the firewall on the master cylinder. Replace your old, faulty brake booster with this brand new factory GM part at a fraction of the dealer price.

New. Never Installed. OEM part. Bulk Overstock

GM Part # 20838827

Alternate Part #'s 178-0823 ; 1780823 ; 25846373

Item is number 2 in the GM diagram.