This article details that Aprilia are recalling Brembo master cylinders to replace a plastic component with a metal one
https://www.asphaltandrubber.com/recall/brembo-brake-recall/
"The issue stems from the Brembo’s popular PR16 radial master cylinder unit (the master cylinder that is often paired with the Brembo M50 calipers), which apparently can crack internally at the piston, which can then lead to front brake failure. "
https://www.asphaltandrubber.com/recall/brembo-brake-recall/
"The issue stems from the Brembo’s popular PR16 radial master cylinder unit (the master cylinder that is often paired with the Brembo M50 calipers), which apparently can crack internally at the piston, which can then lead to front brake failure. "