you should notice better grip from the new brakes in about 75 miles or so. might take a little longer with the pads you got though. The pedal will feel a little soft, but it shouldn't go to the floor and be mushy. Drive around for about a good week, and if the brake stopping power doesn't get any better, then check your brake fluid, and be sure your rear brakes are adjusted properly too. The rear drums don't like to adjust themsleves very well like they should, so by adjusting them, you will feel much better stoping power right away. Do this. Fully depress your brake pedal, then pull up on the e-brake handle. If your drums are adjusted correctly, then the handle should come up quite a ways and be kinda loose.Drive the car and let off the gas, and pull up on the e-brake lightly. You should feel the rear brakes start to grab with about a few inches of e-brake handle. If the handle comes up a lot without much feel of the rear brakes starting to stop, then adjust your drum brakes. All new brakes take time for proper break in, but you should notice better stopping every time you drive your car.