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I always felt that my DB9 brakes were underwhelming, never filling me with confidence particularly from high speed.
The DB9 brakes were reasonably well specced being 4 piston Brembo calipers front and rear but rather small pads and discs in my opinion.
I decided to go 6 Piston calipers from the DBS with 2 part 410*35mm discs on the front and standard rear calipers with 2 part 380*28mm discs.
I used discs and front pads from Gary Penhall
I used the stock DBS front caliper adaptors and made my own brackets for both the main and hand brake calipers on the rear. The result is much better bite and stopping power , confidence inspiring (and IMHO look much better)
For more information http://db9s.com/db9-upgraded-brakes/