Is there any way to determine if your car has already had the modification installed, as I have only had the P38 for a year now and have no history on the work performed on it in its previous life? I have on two occassions, had a strange brake reaction when the car has been first started up and felt like a bit of a fade and shudder. There was no further brake issue after further driving and I do not think it was ABS as the break pressure used at the time was only moderate at most. All fluids are at correct level.

