If you were ever curious what makes your window go up and down in your car or truck, it's the window regulator. In order to make the window go up or down the regulator has several moving parts that operate together to achieve the desired function. As with anything these moving parts eventually wear out and need to be replaced. If you have noticed increased resistance when rolling your windows up or down, you might want to look into a replacement regulator. When choosing a replacement you can count on Meistersatz window regulators.