[horsepower_and_hounds]

My pads rattle (clunk) in the calipers also....they have on the last 3 BMW's I replaced pads in. Z16 in the 1 series and M235, Z23 in the M4 & M2

Just so you know the Z23 & Z26 share the same pad. The only difference it the backing shim. The Z23 has a rubberized backing shim to dampen more noise the Z26 has just a different thickness non rubberized shim to increase its resistance to heat that larger cars or higher HP cars can generate on the pads but it is the exact same pad & material.

Their pads are great and quite affordable that is why I continue to use them...but then I don't officially track. I am going to try out a set of Z26's to see if the different backing shim causes additional noise. The Z23's have always given me a shout when backing out of the garage.....my wife just loves it in the morning when she is sleeping