Occasionally, I hear the brakes squeal on the 430 I just purchased. I am familiar with replacing regular car brakes but never had CCM (wow are they expensive). 1) How do I measure the brake pads for wear? 2) The car has 30K miles - does anybody have an idea how long the brakes normally last before needing replacing? 3) Is there any difference in the way the brake pads are replaced CCM vs. Steel? Thanks for any help.