Quote:
Originally Posted by Fifty150hs
Aren't the anti rattle clips on our brakes there to stop that?
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Aye, that they are....
The basic issue is that the pads need to "float" in the caliper frame. The fit needs to be loose enough to allow movement for perfect pad-disc alignment but be tight enough not to allow the pad move and make a clunk. There are several springs on the calipers to dampen any excessive movement, but they are (clearly) not 100% effective...
I suspect that this becomes more of an issue as the guide pins age, wear and get "gunky". This causes the pads to not "retract" from the disc as much as when working properly, allowing the disc to "rotationally shove" the pads back and forth a little in the caliper frame when the vehicle is changing direction or when the brakes are applied. This hammers the pad backing plate and the caliper frame, increasing the clearance and therefore the movement.
Sometimes you can get a small clunk when applying the brakes. Same issue - same cause - the pad has slight play in the caliper frame.