I don’t recall seeing this issue in any previous Forza game this car has appeared in. The stock brake caliper font on the 2019 Vantage is wildly incorrect. This seems to be an oversight from porting assets, as the font looks like some commonly used Microsoft font, nothing like the real AM font. This issue applies to stock brake calipers on all wheels.
The font used on real life AM Vantage brake calipers is the actual Aston Martin font. There is not a version of this car that uses what seems to be Arial on brake calipers.