According to Reuters, 59 complaints have been submitted revolving around an "intermittent loss of assisted braking" which means the car takes longer to stop. Interestingly, the rate of complaints is increasing. Toyota is reportedly cooperating with NHTSA and there has not yet been an official recall on the Camry Hybrids.
In 2006, Toyota said Brake Assist was "an electronic function that senses an emergency stop and applies increased braking power once the driver touches the brake pedal." When Toyota unveiled the 2007 Camry Hybrid, it proudly stated that the new Brake Assist function would be standard. Other Toyota hybrids have had problems with their brakes in the past, including the 2010 Prius and Lexus HS 250h hybrid. You can read some of the complaints about Brake Assist in the Camry Hybrids to the NHTSA here. People are saying that the "Check VSC" lights can come on before the brakes loose some of their power and a lot of them are being quoted repair costs of over $3,000 by Toyota dealers.