Originally Posted by
Goldenrivett
It's not friction causing the difference - it is reverse credit.
FlightDetent explained in post #5.
You are not simply comparing only the effect of brakes and runway friction.
Autobrake Low simply sets a deceleration rate which might be achieved initially with reverse thrust and the brakes hardly doing any work.
If the published Landing Distances assume no reverse credit on a dry runway but use of reverse on the others, then your observations make sense.
See
https://www.fly19.net/wp-content/upl...erformance.pdf
A320 Landing distance calculation tables for all the runway conditions have reverser column, that is, you can decide whether you use it or not. As I mentioned earlier, the 500 foot difference is still there with all the parameters set at the same values for different runway conditions.
You might want to look up the landing distance tables contained in QRH which can be found in the link you provided.