SPD Bias bar with mounting base The SPD brake wave system with brake plate is designed for those of you who are satisfied with their original pedal stand but want to be able to access the brake wave function where you are allowed to optimize your brakes and freely set the distribution of braking force between front and rear brakes. Simply to find the perfect brake balance! This brake pad replaces the original brake servo. In most original brake systems, the manufacturers have ensured that the car has a lot of braking power at the front and insignificant at the rear so that the car is easy to drive and as safe as possible. Hardly something you aspire to on a track racing car where maximum braking performance and perfect brake balance are most important. By being able to adjust and optimize your brakes, you can easily increase the rear braking power to the extent that you get the maximum from your rear brakes without the rear tires locking up during hard braking. This will cause the car