[mrtimstik]

Those are two very good questions. Another is, what condition are your pads or shoes in, on the front? Possibly you have tried this already but on my car with front discs, I push the breaks real hard then hit the button and it holds the fronts firmly. Then, while holding the button, I floor the gas to get the rears spinning quickly as to not budge the car forward at all. Worked from the first time. When you get it working correctly you will be very happy with the smoke. Best of luck.