Brake knock-off, what is it and why does it cause drivers to tap the brakes when they're still at wide-open throttle on a straight? It's not uncommon to see professional and amateur drivers tap their brakes before a braking zone not to brake check their opponents or cause any confusion, but instead to help ensure that brake knock-off, also known as brake knock-back or pad knock-back, doesn't cause them to lose firmness and feel in their brake pedal. In the worst-case brake knock-off can restrict