Toyota Canada is aware of a small number of isolated reports of inconsistent brake feel in certain 2010 model year Prius vehicles and we are investigating those reports.
Some customers have reported inconsistent brake feel during slow and steady application of brakes on rough or slick road surfaces when the anti-lock brake system (ABS) is activated in an effort to maintain tire traction. The system, in normal operation, engages and disengages rapidly (many times per second) as the control system senses and reacts to tire slippage. A running production change was introduced last month, improving the ABS system’s response time, as well as the system’s overall sensitivity to tire slippage.
Toyota Canada is working with Transport Canada on this issue. However, until our investigation is completed, it would be premature to comment.