A decent price for an essential component of your braking system, without the use of rear emergency brakes your car will not adjust its rear disc braking system. If you drive a lot of kilometers on the road, you must use the emergency brake at least once a week, otherwise the emergency brakes may not work properly and the rear disc brakes may not have full braking effect. Many do not know how to adjust the rear disc brakes, here's how, with emergency braking.