Engine problems of the 2010 Toyota Prius

I travel quite a bit these days and on my way home from coachella music festival, my brakes gave out. I mean to say, pushing the pedal all the way down, no resistance, no slowing, a completely limp pedal. . . . Until I repeatedly stomped on it and the car locked and skidded to a stop, feet away from the car in front of me. The brakes returned intermittently, so I took the right hand lane at 40mph and tested the brakes regularly until I got to my dealership. Scariest thing ive ever experienced. Ive had the car since August 09' and currently have 43k miles on it. I know thats a lot, and its unfortunately outside of my warranty now, but I wanted to log it here, as soon as I could. It started one day before the freeway incident, whenever I would depress the pedal, a loud high pitched squeak would come out. I didnt think much of it outside of "better get that looked at" but didnt notice any brake failure. The next morning, I turned on the car and every dashboard light came on and a fast consistant beeping went on for about 5 minutes, during which time the brake pedal had zero resistance. I sat there with a serious wtf look on my face, when out of nowhere, the dash lights went away, as did the beeping, and the car drove as normal with full regular brake pressure (besides the squeak). I received a call back from the dealership. They say it's going to be $3k for a master cylinder replacement and that Toyota corporate wouldn't aid in the cost, despite my hybrid warranty still covering the hybrid ecu (the master cylinder unit includes the ecu). Margaret (my dealership service manager) said herself that it was not my fault and that the part is not repairable, "it either works, or it does not. It must be replaced". This could have been catastrophic, had I been any closer to the car in front of me. The failure of one part (which failed through no fault of the customer) rendering the brakes nearly useless is too scary not to report here. Thank you david del fonzo.

Loss of braking effectiveness. Happens when going over bumps while applying the brakes. You don't lose braking power completely, but it would be like you had lifted your foot off the brakes partially. It has happened about a dozen times since I have owned the vehicle (a little over a year). I am unable to determine what factors make it happen. I don't know if it is speed, severity of the bumps, or braking pressure, or combination. I know that temperature makes no difference, as it has happened in winter and summer. The last incident happened when a bicyclist moved in front of my car to avoid bumps. I applied the brakes (it was not severe), and as I went over the bumps, I lost braking power. My speed was approximately 15 mph. Toyota has done a recall on the brakes, but I continue to have the problem. I have talked to other owners, and they are having the same problem, even after the recall. The consumer stated when he drove over a bump in the road, the braking decreased significantly for approximately 3 seconds. He also stated the engine raced briefly, but the vehicle was not in gear at the time. Updated ivoq 03/01/11.

2010 Toyota Prius. The consumer stated he experienced two safety issues; loss of brake effectiveness and engine race when the consumer applied the brakes when going over bumps/rough roads, or in marginal conditions due to snow/ice when approaching a stop sign, he would lose braking effectiveness. The consumer took the vehicle to the dealer for a recall repair on March 24, 2010. However, he continued to experience loss of brake effectiveness. The consumer pulled into a neighbor's driveway after driving less than one mile from his home. After pushing the park button, but before pushing the power button, the engine began to race. It was not at an extreme high rpm and it was not for an extended period time, but it did last for several seconds. After the vehicle went down to normal rpm, after a s second or two, it began all over again. The consumer stated it was not a surge as the vehicle was not in gear at the time.

I was driving on the freeway with my cruise control on. It was set to 56 mph. All of a sudden, the vehicle started lurching. It was like it was trying to accelerate then slow down, then accelerate, then slow down. I immediately shut off the cruise control. It has also happened again today when I tried to use the cruise control.

2010 Prius ii - when in park, or just slightly on the brakes and the engine switches from electronic to gas motor, the car rocks forward 1-3 inches. Very terrifying, but according to kendall Toyota of eugene, oregon, this is "normal". I don' t know of any world in which a car moving on its own while in park is normal.

Prius 2010 braking issue - problem has occurred at least 5 times; on rough surface, downhill surface or when wheels encounter a manhole or steel plate road cover. Problem is recurring. Car has 12,600 miles on it.