I just have now this error 4460 and I wonder if .. Purging brakes without using a PIWIS ..could be one of the causes (beside the ones listed above) ?
In my case, this is a (2001) 986, on which I have a Brembo big brake kit in the front (large rotors with 6 pistons calipers) since about two years.
I never was real 100% happy with the brake pedal feel, and this .."for ever" with any 986 or 996 (more than 15 years of these).
Since about two month, I changed on my Boxster the Master Cylinder, OEM to TRW PMN166 (Turbo type).
Btw, for your info, since this change, I would say th