Brake Antilock Control Unit/module problems of the 2010 Toyota Prius - part 2

I own a 2010 Toyota Prius which was purchased in September 2009. My brakes fail to immediately stop my car when applied going over bumpy sections in the road, hitting a pothole, or when on slippery sections of the road. When hitting a bump it actually feels like the car lurches forward. The car will eventually stop after pushing the brake to the floor with force. It is very disconcerting and the potential for hitting the car in front of you or a person is very high.

I was braking my 2010 Prius iii when I went over some railroad tracks. The vehicle suddenly accelerated and I had to step off the brake pedal and re-apply the brakes to get the vehicle to begin braking again. The acceleration lasted for more than 1 second and the vehicle didn't start braking again, until I had reapplied the brakes.

The brakes in my 2010 Toyota Prius do not operate properly. I have had the car 3 months with 1847 miles. Over this time I must increasingly press the brake pedal closer to the floor to stop the car. Today in dry weather, I nearly hit the car almost 50 yards in front of me when it stopped and although I pressed the pedal firmly it took a very long time for the brakes to grab.

Prius braking problem when going slow speeds over a bump or pothole.

The contact owns a 2010 Toyota Prius. She stated while braking at speeds of less than 15 mph and going over a pothole and railroad tracks the brakes would intermittently hesitate to function properly. Within moments, the brakes would respond normally. On a separate occasion, while traveling in snowy conditions at speeds of under 30 mph, she attempted to depress the brake pedal and it would not engage. The vehicle did not slide; however, the brakes did not engage and she proceeded to crash into a curb causing moderate damage to the front passenger's side tire and rim. There was also a loud grinding noise coming from the vehicle after the crash occurred. The vehicle was taken to the dealer where she was awaiting repairs. There were no recalls. The failure and current mileages were 1200.

The contact owns a 2010 Toyota Prius. The contact stated that with his feet on the brake pedal while driving 20 mph over a bump in the road or a pothole the vehicle lunged forward and accelerated. The dealer has not diagnosed the failure and it occurs more frequently. The failure mileage was 200.

The contact owns 2010 Toyota Prius. The contact stated when ever the vehicle goes over a bump in the road or pothole the braking system will not slow the vehicle down even though the brakes are being applied. Also the contact stated that it takes to much pressure to apply the brakes for a new car. The contact took the vehicle to a dealer and the service tech. Drove the vehicle and informed the contact that the brakes were fine and that is how the vehicle is designed and to apply more pressure. The contact does not feel safe driving this vehicle because the vehicle hit a bump and accelerated in to a intersection while the brakes were applied. Failure mileage was 2.

My 2010 toyata Prius (purchased in sept. 2009) has had repeated problems while braking over a patch of road with small potholes. If the brakes are engaged while over the patch of uneven road, the car lurches or "jumps" over the spot on the road and the brakes don't begin to catch until the car gets over the patch. This has happened 5-10 time over the last four months at a stop light.

The contact owns a 2010 Toyota Prius. While driving approximately 25 mph over rough, bumpy surface or a pothole and trying to depress the brake pedal, the vehicle seemed to seize and glided instead of slowing down. The failure occurred on one occasion. He called the dealer and was told that there was nothing they could do about the failure. He had not spoken with the manufacturer to-date. The vehicle had not been repaired at the time of the complaint. The current mileage was approximately 150. The failure mileage was approximately 100.

I was driving my 2010 Toyota Prius down the road here in berkeley, CA, and applied the brakes as I was hitting a bump in the road. The brakes did not work. I thereafter lifted my foot off the brake and hit them again, at which point the brakes worked correctly.

The contact owns a 2010 Toyota Prius. While driving 10 mph with the brake pedal engaged, the vehicle accelerated on its own . The contact was forced to apply pressure to the brake pedal in order to stop the vehicle. The contact has owned the vehicle for 5 months and the failure has occurred twice. The dealer was called and stated that they have not received any recalls for his vehicle; however, to bring it into to the dealership for a diagnostic test. No repairs have been made to the vehicle. The failure mileage was unknown and the current mileage was 3227. Updated 03/12/10. Updated 08/30/jb.

My Toyota pruis 2010 which I purchased on Nov. 30 2009 had unexpectedly lurched forward when I was slowing down and applying the brake. I was taken by surprise and fortunately it stopped after I stepped on the brake very hard. This has happened several times already.

The contact owns a 2010 Toyota Prius. While driving approximately 20 mph over a rough surface she noticed that the brakes would momentarily disengage. The vehicle has not been diagnosed by the dealer. There were no prior warnings. The current and failure mileages were 2500.

My 2010 Toyota Prius has the same problem that are listed on this site with brakes. When trying to stop immediately after a bump or pothole and during minor slick condition the brakes don't react immediately. A couple of weeks ago I slid into an intersection with my brakes fully engaged before the brakes kicked in. Thank god no car was in front of me. The car behind me saw what was happening and slowed down. This brake problem occurs weekly since my purchase of the vehicle in September 2009.

2010 Prius loses brake force when regenerative braking is used over potholes or other uneven surfaces. It appears that when wheel slip occurs when braking in such instances, the regenerative system is disengaged causing loss of braking until the friction brakes are engaged by depressing the brake pedal farther. This has occurred on multiple occasions and can be replicated.

I was driving my 2010 Toyota Prius (which I'd taken delivery on about January 6), and I noticed what seemed to be a power surge or a momentary brake failure when I went over a pothole while I was slowing down after exiting a highway. The car seemed to lurch forward, so that I had to take my foot off the brake and re-apply it. This happened first on January 20, but has occurred three times since then. I've been trying to figure out what it was; at first I thought it was a power surge. But when I saw the article in the new york times on February 3, I knew that was exactly what had happened to me. Every time it's happened as I was braking over a speed bump or pothole. I have made an appointment with my Toyota dealer but have not gone yet.

I bought a 2010 Prius in October. I live in maine where winter driving conditions are not great. I have had three incidents now of driving at a low speed on plowed but snowy roads where the brakes did not catch when I applied them. Once was going around a downhill curve which was scary. Each time they eventually catch but not until I have skidded for about 3-6 ft. Fortunately, I have not hit anyone yet. I called my dealer yesterday and was told there had not been a recall and there was nothing to be done about it yet.

When applying the brakes to come to a stop at a red light, my 2010 Toyota Prius iv hit some rough road and began to surge/accelerate even with my foot on the brake. I pressed harder until the brakes were re-engaged. This has happened under similar circumstances (rough road) three times since taking ownership of the car sept 15, 2009.

When driving I sometimes momentarily feel a pause in the braking system of my new Prius. This occurs every time I drive on a certain street at a fairly high speed. While I am braking my right front tire goes through a pothole while my front left tire remains on flat tarmac. As my front tire comes out of the pothole I feel as if the brakes stop working for half a second and then they start working again. I estimate that I am driving through the pothole around 20-30 miles an hour. I drive this way every day from my work to house and I am always braking on this stretch of road as I turn a corner right after the pothole. There is a traffic light right after the pothole so whenever the light is green as I approach the pothole this happens to me. This has happened to me around 50 times - ever since I bought my new Prius in September 2009.

2010 Prius brake applied in zero temperature weather approaching a red light on slight down sloping road covered in ice/snow. The brake pedal was pushed as would normally be applied (maybe approx 1/3 - 1/2 brake pedal travel) and there was no applied braking. The car kept rolling forward to where I had to make a decision to continue rolling with a right turn into the intersection and continue travel. Luckily the oncoming traffic was far enough away to not crash into me. I would estimate that the brake was applied for about 1-2 seconds, enough travel time to force me to make a decision that I needed to continue through the intersection before the oncoming traffic. This same type of scenario occurred on an exit off of an interstate ramp down another down slope with ice/snow that again when the brakes where applied, the regenerative engine brake applied, but when the abs went to engage due to the slippery surface, there was a 1-2 second duration of sensation of no brakes. Pushing pedal further (or just waiting the 1-2 second delay) seemed to eventually apply brakes. I am a systems/test engineer that performs numerous work on commercial and military aircraft and I now know how to anticipate this situation for myself (I. E. , I am more careful on braking earlier especially on slippery surfaces more than normal distance from my other Honda vehicles on same type of surfaces to account for this possible 1-2 delay time in braking); however, this is unacceptable for my wife who does not have the same experience as I do or same technical feeling of what this vehicle is doing. Again, if the traffic on that one intersection was closer to me than it was, there would have been a side impact collision. I have yet to experience this issue on solid roads over bumpy surfaces. With today's Toyota revelation that the Jan 2010 Prius has a fix for this, I demand to have this same fix applied to my three month old 2010 Prius.

My 2010 Prius accelerates over bumpy road conditions irrespective of whether or not my foot is on the brake or not on anything at all.

The contact owns a 2010 Toyota Prius. The contact stated that whenever she attempts to stop on an uneven road, the brakes fail to stop the vehicle. Whenever the failure occurred the speed varies. The vehicle also briefly lunged forward and accelerated. The brakes squeak continuously when the vehicle is driven. The vehicle was taken to the dealer who confirmed that the vehicle was functioning normally since it has an electrical engine combined with a gasoline engine. The failure mileage was 18,000.

The contact owns a 2010 Toyota Prius. While the contact was driving 20 mph, she attempted to stop the vehicle and noticed hesitation when the brake pedal was engaged. The vehicle has not been diagnosed by the dealership and there were no prior warnings. The current and failure mileages were 2747.

2010 Toyota Prius braking problem. I bought a 2010 Toyota Prius approx 4 months ago. During the approx 10000 miles I have put on the car, I have experienced a braking issue approx 5 to 6 times. Most times I was braking for a stop sign in a 30 mph zone. Once I was braking for a red light in a 45 mph zone. Each time, there was bumpy road during the braking, and the brakes released. I can't say if the car accelerated, or it just seemed that way because of the brake release. It did not cause any accidents, but once it was on a snow covered hill and I slid out into a 2 lane 50 mph highway. There was no traffic, and therefore no accident. Another time, I was stopping from 45 mph at a red light, and under braking, again on bumpy roads, the brakes released and I nearly hit the car in front of me. The brakes released enough allow me to panic and jam the brake pedal to the floor. The car stopped quickly.

The contact owns a 2010 Toyota Prius. The contact stated when driving downhill and attempting to brake, the brakes would not engage and intermittently could not be depressed. The contact had received repairs under NHTSA recall campaign id number: 10v039000 (service brakes, air: antilock: control unit/module). The dealer was unable to duplicate the failure and no further repairs were made to the vehicle. The manufacturer was contacted via email and the contact was awaiting a response. The failure persisted. The failure mileage was 5,000 and the current mileage was 9,000. Updated 07/06/10. Updated 11/15/10 the consumer stated there is still a delayed response in the braking mechanism when going down hills. Updated 11/24/10.

The contact owns a 2010 Toyota Prius. While driving approximately 40 mph on uneven roads, the vehicle failed to stop immediately when the brakes were applied. The vehicle also lunged forward. The failure mileage was unavailable. The current mileage was 5300.

Applied brakes at a stop light. The Prius (purchased in July of 2009) ran over a bump, and it seemed like the brake disengaged. I removed my foot from the brake pedal and reapplied the brakes. The brakes seemed to engage and came to a stop.

The contact owns a 2010 Toyota Prius hybrid. While driving approximately 20- 25 mph on a slightly snow covered road surface there was pressure applied to the brake pedal, followed by an unintended acceleration. The driver continuously applied pressure to the brake pedal; however, the vehicle failed to slow down while proceeding through an intersection. An opposing vehicle crashed into the front passenger side and there were no injuries. The police was called to the scene. The vehicle was completely destroyed and towed to a collision center. The VIN was unavailable. The cause of the failure has not been determined at this time. The failure mileage was 7,700. Updated 03/12/10. The consumer stated when he approached a stop sign with adequate distance to stop, pressure was applied to the brake pedal. When the vehicle would not stop, he had to press harder to get the vehicle to stop. Updated 07/13/10.

The contact owns a 2010 Toyota Prius. She stated that while applying the brakes at any speed more than 5 mph and over a pothole the vehicle responded as if the brakes had failed and it attempted to accelerate. Within seconds, the brakes would reset and function normally. The manufacturer nor the dealer were notified. There were no related recalls. The failure and current mileages were 8,400.

The contact owns a 2010 Toyota Prius. He stated that while depressing the brake pedal at speeds of 10-15 mph and going over a rock or a speed hump, the brakes would loose traction momentarily. The dealer was contacted and advised that was a normal function of the abs braking system. No repairs were made to date. There were no recalls. The failure and current mileages were under 5100.

The contact owns a 2010 Toyota Prius. While engaging the brake pedal driving approximately 20 mph over a pothole, the brakes temporarily failed to function. The failure occurred whenever he drove over rough road surfaces. The dealer stated that when a fix becomes available they would notify him. The manufacturer was not notified. The current mileage was approximately 4,000. The failure mileage was approximately 2,500.

The contact owns a 2010 Toyota Prius. While driving speeds of less than 15 mph over a pothole, the brakes malfunctioned and reset themselves within minutes without having to shut the engine off. Neither the manufacturer nor dealer was contacted. There were no recalls. The failure and current mileages were 2200.

The contact owns a 2010 Toyota Prius. The contact stated whenever she was applying the brakes, the brakes cease to work periodically when going over a bump or a pot hole. The vehicle lurches forward as the brakes are depressed whenever she hits a bump. The vehicle was taken to the dealer and contact was told it was her imagination and nothing is wrong with the brakes. The Toyota manufacturer had not been called at the time of the complaint. This failure has happened from the day of purchase . Updated 03/15/10 the consumer stated when the brakes were depressed ocassionally, the braking mechanism would fail momentarily which caused the vehicle to lunge forward . The consumer had repairs made to the vehicle. However, the problem continued. Updated 09/15/10.

The contact owns a 2010 Toyota Prius. The contact stated that while driving 20 mph while driving over pothole with his foot on the brake pedal when the vehicle accelerated on it own. This failure occurred 5 times and has continued to occur every two weeks. The dealer confirmed that the abs system caused the failure to occur. No repairs were made to the vehicle. The vehicle identification number was unavailable. The failure mileage was 200 and the current mileage was 900.

The contact owns a 2010 Toyota Prius. While the contact was driving 5 mph traveling over an icy road surface, the brake pedal was engaged causing the vehicle to slide. Suddenly, the vehicle crashed into a snow bank. The anti-lock brake system was inoperable during the failure. There were no prior warnings. The vehicle has not been diagnosed by the dealer. The current and failure mileages were 400.