Below is a list of Brake Testers manufacturers from Saginaw, Michigan. Brake testers are used to test the effectiveness of a vehicle's braking system. The most common and effective type of brake tester is the roller brake tester, which operates by driving the vehicle's tires over a set of rollers. As pressure is applied to the brakes, the force produced is measured, recorded and displayed by the testing system. Another type of brake tester is the platform or plate brake tester.