This brake master cylinder is precision-engineered to match the design, function, and performance of the original master cylinder on specific vehicle years, makes and models. It is made of new, high-quality materials for a safe, durable replacement. Vehicle model years this part fits (be sure to check your vehicle trim using the Amazon garage) - [Kenworth T680: 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021] - [Kenworth T880: 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021] - [Peterbilt 567: 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021] - [Peterbilt 579: 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021] - [Peterbilt 587: 2013, 2014, 2015, 2016, 2017, 2018]