Two problems related to brake antilock control unit/module have been reported for the 2004 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Prius based on all problems reported for the 2004 Prius.
The contact owns a 2004 Toyota Prius. The contact was driving approximately 25 mph on a gravel road. Pressure was applied to the brake pedal and there was no power response. The vehicle failed to slow down and crashed into another vehicle. The opposing vehicles driver, and passengers sustained moderate injuries. The police was called to the scene. The brake system failure occurred intermittently prior to the crash. The vehicle was taken to an authorized dealer for an estimate of the body damages. Currently, the vehicle was being repaired at an auto body shop. The cause of failure has not been determined at this time. The failure mileage was 186,000.
Warning triangle, dash lights-brake, abs, came on accompanied by a loud whining sound. The next time I needed to use the brakes I discovered that there was total brake failure - pedal down to the floor with no brakes. I was very fortunate that I was able to roll to a stop. I took the car to auburn Toyota (in CA) and they said it was a skid control ecu failure. They replaced it at a total cost of $1868. 74.