Car lunges forward when braking. This occurs at low rates of speed and is particularly prone to occur when making right and left turns. This has been going on since I bought it in 2021. Dealer laughs at me
2021 Toyota Redundant Sienna brakes complaints
Page 2 of 4: complaints 11 to 40 of 80, newest first, as owners wrote them.
This problem has been happening for a while now, over one year. When I am braking there is a jolt of acceleration. This happens frequently, and I believe this is dangerous.
Unexpected sudden acceleration when braking at low speed
When applying the brakes, at lower speeds around 20 MPH my Sienna lunges forward for a few seconds, increasing speeds. This is happening frequently in school zones due to the slow speeds. Dealer told me it was out of warranty (36k or 3 yrs) and i had to pay $250 for diagnostic plus $300 for a TSB solfware reset because the Fed didn't receive enough complaints from users to make Toyota do a recall on this Safety issue. This is a major safety issue myself and many other Sienna owners are dealing with.
In certain conditions, like coasting downhill and lightly braking and then going to harder braking - there is an unintended lurch forward which requires immediate harder braking to stop the vehicle.
Car lurches forward a few feet while braking. Listed approximate start date but it happens intermittently.
When stop at the stop sign and step in the brake... the car momentary accelerates by its self. Its very dangerous. Pls fix the problems Toyota.
-Multiple instances recently of feeling like the car was accelerating or lurching forward lightly while I was braking - thought I was going crazy. Today however, the car very clearly lurched forward while I was braking coming into an intersection with my kids in the car. Checked my foot on the pedal, mats, etc. Will be taken to dealer on earliest appointment they have in 7 days. -If there was a car coming through that intersection, my family and I could have been T-boned due to the unexpected acceleration. -There are no warning lamps or messages active in the vehicle. -Symptoms likely started a few months ago, but the most severe instance was today, 9/16/2024. I finished driving my kids to soccer and while there I googled this and called my dealer. Apparently this is a known issue? -How can Toyota not notify owners of this serious issue? There needs to be a recall immediately. This is my family vehicle that we bought new just a few years ago, this is dangerous and absolutely unacceptable.
Intermittently and randomly the vehicle will lunge forward with the brake applied. I engage the brake, the vehicle slows and then lunges/lurches forward as if I were not braking. Not only is this terrifying but it is also extremely dangerous. This has happened many times since purchase in February 2021 and continues to now.
a "REPETITIVE" 2021 hybrid Sienna Limited accelerates *when my foot is definitely pressing lightly on the brakes*.
See attached document for complaint.
While braking, the brakes will momentarily stop working. This has happened multiple times. Today, it caused the van to not be able to stop in time and the van finally came to a stop in the middle of a four way intersection. I did a Google search. There are many many people in online forums who have reported this same issue.
Acceleration or surge seemingly while transitioning from regenerative braking to friction braking. Observed numerous instances where at slower speeds, after removing my foot from the accelerator and beginning brake application, a surge or acceleration occurs. In these instances I ensured that my foot was NOT contacting the brake and accelerator simultaneously. There is a distinguishable surge in driveline when this occurs. The surge may also be caused or exacerbated by a change in driveline power (engine/battery) occurring simultaneously with the transition from regenerative to friction braking. One of the most concerning instances of the anomaly occurred while turning. When making accelerating, coordinated turn and expecting the vehicle to respond appropriately by decreasing speed, it instead momentarily accelerated. This caused great concern and a moment of panic as I had to immediately react to avoid striking other vehicles or obstacles because my intended path of travel changed as a result of this surge. Since this report of surging of the Sienna Hybrid is also reported by other owners on various forums, I’m willing to have additional sensors installed to enable ample recording of these events. This should be considered a safety event.
The car accelerates during breaking
When applying light brake force to slow to stop for traffic light/sign the vehicle will feel like the brakes have released and stop slowing (feels like vehicle surges forward) requiring to either really apply much greater force to pedal or to release and reapply force to brake pedal to continue to slow the vehicle. Safety concern as without warning and not consistently happening additional 20 to 50 foot braking distance added to vehicle stop. Occurrence is random and happens approximately one in ten stops. The main consistency is a lower speed and gentle type stop: start braking speed generally in the 25-35mph range, brake release feel at 10-15mph range with light to medium braking force being applied. Seems to happen most often with a light downhill gradient. Occurs rendomly and cannot be reproduced on demand for service tech. Has happened since vehicle was bought new and still occurs randomly 26000 odo.
When breaking, mostly during downhill, the brakes feel like they simply “let go” for an instant. Most times this is very short and It feels like a typical downshift during breaking in an ICE car. However, last time it really gave me a lurch and I almost ended up falling off a cliff face. Many reports all over the internet but nothing from Toyota.
The brakes release for a period of time when stopping. This has been ongoing since owning the vehicle. It feels like a lurch forward when my foot is actively braking.
Intermittently, when braking to slow down towards a stop, the brakes let loose, and the vehicle surges forward for a very short spurt (like less than 1 second). While continuing to apply brake pedal pressure, the brakes, then, continue to work. This is VERY unnerving, and we are afraid that, if there were to be a pedestrian in a crosswalk in front of the vehicle they may be hit as this does cause a slightly greater braking distance overall. I reported this to my Toyota service department relatively soon after I purchased the vehicle (new), but they indicated they know nothing of the issue. I now see many people reporting this in various Internet discussion threads. This is a very serious issue.
Sometimes when each of us 2 are slowing to a stop while applying the brake, the Sienna will lunge forward. This unexpected event may cause a rear-end collision if too close. Also, it is enough to cause us to hit our head on the head rest. Can’t understand why this happening. We are sure we only have our foot on the brake and not the accelerator.
Safety of self and others at risk due to odd breaking. Feels like you have to put pedal to the floor to break! Especially if turning. I found a Toyota service bulletin when googling the issue. This is a major safety issue!
There has been several incidents when I step on the brakes and the vehicle seems to accelerate forward after what feels like an attempt to find the right gear when decelerating. This occurs infrequently but usually when decelerating along with an external factor. I was able to consistently replicate when I’m coming off the highway onto a service road then have to make quick turn at a corner. It feels as if the vehicle is trying to search for a gear and once it finds it there’s a momentarily acceleration forward.
2 issues to report 1) when under medium consistent breaking(slowing down for a light) there are instances where the breaks feel like they let up or slipping. This issue has been reported and with the car since the first year of ownership but Toyota says it’s all within spec 2) second issue is an issue with the rear captions seatbelt and has also been reported since 2022 where upon normal driving the seatbelt locks up and the car has to be stopped and seatbelt unbuckled to release tension. Also brought up multiple times with Toyota and no action. Kids sometime unbuckling while car is driving since they cannot move
When applying the brakes, the brakes sometimes feels as if though it "slips" and the brakes momentarily release causing the vehicle to feel like its suddenly accelerating. This has happened on several occasions -- on downhill and on flat roads. After the brake feels like it slips, then the brake returns back to normal.
When my car is going down a steep hill and I have the brake applied, Suddenly the car will speed up and lurch forward instead of continuing to slow down. This is not how cars normally behave in the 30 years I have been driving. I could have slammed into the car in front of me. This has happened over 100 times. My vehicle has approximately 27,000 miles and I have mentioned it at the Toyota service center and it has been checked out and there are no issues that they see. No warning, lamps or messages appear at all
When I apply brakes sometimes the brake is released and I need to push the paddle hard to engage the brake again. Same thing happens sometimes on adaptive cruise control. It sometimes release the brake and I need to push the paddle to engage the brake.
Occasionally when easing on the brakes the van will accelerate. The engine will rev up while depressing the brake pedal, the van will start jerking and jumping trying to stop and go at the same time. This has happened on numerous occasions in parking lots at slow speeds and while driving on a busy road.
This is a follow up to the federal safety agency ID Number: 11542558. We have determined that this issue does not merely involve the brakes releasing, but the vehicle actually accelerates during the incident. Our 2021 Toyota Siena LE AWD has an issue where, while steady pressure is being applied to the brake pedal, the brakes will randomly release and the car will actually accelerate briefly. While attempting to slow or stop the vehicle with steady pressure on the brake pedal, the braking action will momentarily give out, resulting in the vehicle lurching forward beyond the anticipated stopping/slowing distance before the braking action re-engages. In many, if not all occurrences, the vehicle actually accelerates. For example, if the incident occurs while driving up a hill, not only will the rate deacceleration decrease, but the vehicle will actually accelerate up the hill briefly before the braking re-engages. This issue occurs on a regular, but seemingly random basis, multiple times per week. This issue occurs under all driving conditions (hot or cold, dry or wet, smooth pavement or rough surfaces). It occurs at all driving speeds, including under 25mph and over 55mph. This is a dangerous condition that could cause serious injury or death. This could easily result in a collision with cars, bikes, or pedestrians as the vehicle suddenly stops slowing without warning and unexpectedly accelerates. It could also result in a serious collision from cross-traffic if the issue caused the Sienna's stopping distance to go past a stop sign or red light into an intersection. The problem is intermittent and difficult to reproduce, but has occurred repeatedly over the 35 months we've owned the Sienna. No warning lamps, error messages, or other related symptoms are associated with these occurrences, either before or after an occurrence of the problem. Please investigate and require Toyota to issue a recall.
I have this car for 1 year, and I’ve have problems when I am driving and I have use the brake the car stop and keeping going forward ,I already had a accident hitting a car in front me,I’ve see a lot complain about this problems and the Toyota is not getting fixed and keeping saying that is the driver fault,I work as a driver I need this problem get fix.
The contact owns a 2021 Toyota Sienna. The contact stated while driving at approximately 50 MPH, the rear end of the vehicle started to sway to the left and the right. The contact attempted to steer the vehicle however, the steering wheel was very difficult to turn. Additionally, the contact depressed the brake pedal, and the pedal was very loose and depressed to the floorboard. The contact pulled over and had the vehicle towed to a dealer. The contact stated that the dealer was not able to duplicate the failure. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 73,000.
When you apply a brake, the vehicle initially responds with an impetus to stop, then the brakes seem to disengage for a fraction of time and then engage again. This is all with the foot being on the brake pedal. It is perceived as if the vehicle continues to move by inertia or accelerates when you hit the brake. Occasionally, it feels like a delay in brake response time. The brakes issue is sporadic.It may occur 2-3 times a week or may not come up for a few weeks. As a result of the problem, the deceleration-to-stop distance is greater than you would expect under normal brake functioning. The issue is consistent across the primary and secondary driver of the same vehicle. The brake problem most often occurs when the car is going down the hill or when there is a short distance to stop, such as at a stop sign or red light in an urban area. The other driver reported that the problem occurred when there were bumps on the road.There are no warning lights indicating the problem with the brakes. The problem was reported to the dealer; however, the issue could not be replicated. The dealer advised us to have a Toyota representative perform the inspection as the problem would most likely not be identified because it is sporadic. As a result of the issue, I got in a car accident on a highway hitting another vehicle in the rear, when it made a sudden stop. The brake did not respond when I applied it two times in an attempt to stop, and my vehicle continued to move with my foot depressing the brake pedal. After the accident, the issue persisted. It recurred three times within one week after about 10 days of driving without issues.
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