Well, if you don't shim them that's the problem you will have..if you even manage to get your car moving. With the spacers, we center the caliper over the rotor. Differences in space between rotor and pad, if any, are tiny...too small to see with the eye. If there are, the pads will merely wear down until they are even. so far so good...definitely better.
my car
Chris Arslanyan
More install pics to come.
