I'm running the GiroDisc Magic Pads and do not have the knock. I did have the knock with the OEM pads when brand new, but it eventually went away as (I assume) the clearance between the caliper and clips got filled with dust. The Magic pads have been a decent street pad. No noise. Dust is on par with OEM--maybe a tad less, but not much. Outright power and fade resistance is good for spirited street driving. I do wish they had a little more initial bite.
Pros: No noise, decent street pad
Cons: little more initial bite
Vehicle:
Chevrolet Suburban
