View 7 Photos View 0 Videos 2015 Peterbilt 389 Valve Newly Listed Contact for price Paccar MX13 Engine Back Pressure Valve / Exhaust Brake For Sale, Used. P/N: 2128860. Call for more information, we ship everywhere. ConditionUsedFits To Make(s)PeterbiltFits To Model(s)389Will Fit Year(s)2015Part Number2128860Stock NumberPT-0755-87 MLS Number14671690CategoryValves Last Updated10/17/2026 LocationYork, ON, Canada Sold ByLomoca Inc. (833) 835-___ SHOWNUMBERCall Seller Email Seller Save More Info