The fault is believed to be a crack in the internal piston of the PR16 radial master cylinder.
The crack can result from prolonged and hard use such as track work or frequent use of ABS.
Obviously, if it breaks, not only will braking force be diminished, but owners could also end up wth highly corrosive brake fluid leaking over their bike.
Brembo says the problem is with the plastic (polyphenylene sulphide) they used. To fix it, they will replace the plastic piston with an aluminium piston.
So far, recalls in the USA affect the following models:
2016 and 2017 Aprilia RSV4s fitted with Brembo brakes;
2017 Aprilia Tuono 1100s fitted with Brembo brakes;
2015-2018 Ducati 1299 STD / 1299 S / 1299 FE / 1299 SL produced from March 16, 2015 to September 22, 2017;
2015-2018 Ducati Monster 1200 S / Monster 1200 R produced from March 04, 2015 to October 23, 2017;
2015-2018 Ducati Multistrada S / Multistrada PP produced from March 16, 2015 to October 31, 2017;
2015-2018 Ducati Panigale R produced from March 16, 2015 to June 20, 2017;
2017-2018 Ducati Scrambler 800 Cafe Racer produced from March 01, 2017 to November 20, 2017;
2015-2018 Ducati XDiavel S produced from January 12, 2016 to September 08, 2017.
We will advise if there are any Australian recalls.
Brembo recall notice
Here is the official notice from Brembo about the fault:
The anisotropy of the piston material, in addition to potential porosity introduced during the injection process, could lead to crack generation and thus potential component failure. The failure may occur with no warning to the rider, although a significant loss in brake effectiveness may be an early indicator.
In May, 2017, Ducati received initial information from the field regarding front brake malfunction involving a motorcycle in the European market. During the same month Ducati received a second European front brake malfunction report.
Ducati initiated an investigation and began to jointly conduct an analysis with Brembo, the component manufacturer. In September, 2017, a third European case was discovered. Failure was found to have occurred during race track use in two of the three cases. In November, 2017, the investigation was finalised and the root cause was identified as above. On December 14th, 2017, Ducati determined that a worldwide safety Recall was justified. For subject motorcycles sold in the US, there have been no reports of injuries due to the defect.”