Sound at front end under braking/deceleration

[Paul]

I think I may have a possibly answer.


Discs are warped.


But not warped in that they run out of true from side to side but run out of true up and down.


When I spin the wheel and watch the top of the disc running through the pads it rises and falls, not a lot probably only 1 - 2mm but it definitely is not running true.


Whether it's always been like this I'm not sure.
But as it rises and falls you get the clacking sound at that same point every time.


And, the disc is worn in its surface, again not a lot (maybe only a tenth of 1mm) but the disc surface is not dead flat.
It's got a raised part which runs all the way around it about two thirds the way down from the edge of the disc.


The raised bit of the disc will rise and fall as the disc is no longer perfectly round (or rather doesn't run perfectly round through the pads).
It's possible that it will rock the pads on the pin as it goes through them and hence cause the clacking noise.


It's only a theory.
Let me know what you find.


I suppose on the plus side it doesn't seem to affect the braking and it's been like this for thick end of 10,000 miles.