Service Brakes Problems of Lexus Rx400h - part 2

Brake slippage on 2006 Lexus Rx400h - I bought this new in 2005 and ever since then, we've seen the same kind of brake slippage that other owners have been reporting. When we're braking to come to a stop, the vehicle will suddenly lunge as if the brakes stopped grabbing or slipped. The car does come to a stop with continued pressure but the sudden feeling of acceleration is most disconcerting. I take it to the dealer for all scheduled maintenance and each time I'm there, I mention the braking issue. And, each time, they tell me that its normal for the types of brakes used in the hybrid technology.

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Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6) *year: 2008 * make: Lexus * model: Rx400h * component: the hybrid braking systems * VIN: [xxx] * component -- the 2008 Lexus Rx400h hybrid braking systems does not work properly. When the vehicle goes over a small road depression or a small pot hole on one side of the wheel, it temporarily lost control of the brake while the driver's foot is on the brake pedal. It also behaves the same way when the vehicles slips on the snowy road. It is very similar to Toyota prius braking problems. I reported to the Toyota dealer. The Toyota dealer told me that it intended that way. If the vehicle is driving in a traffic bumper to bumper, it is very likely to hit the car in the front rear end when the brake systems let go the brake while the operator is pressing on the brake pedal. It is a safety issue. It happens every time and it can be duplicated under the above conditions. They should fix this like they do with the prius.

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I have experienced the exact braking problem in my 2006 Lexus Rx400h as described in recent "car guys" column. While coasting to a stop with foot lightly on brake pedal, if I suddenly step harder on brake, it seems to disengage for a second before the brake takes hold again. My guess, same as the car guys, is that there is a slight delay in switching from regenerative braking to regular friction braking. It is disconcerting, but something I can live with as I am a cautious driver -- leave plenty of following distance, etc. This has happened occasionally, at various times, so "incident date" is fictitious just to get through this form.

I have 2006 Lexus RX 400h and have the same problem with my brake as prius has. When I slow down a car and my car hits a rough patch of surface, or pothole, the brake seems to release and I experience 'brake surging'. Several instance I almost hit a pedestrian because the car surged forward at an intersection. I brought the issue to the Lexus dealer but they said they could not replicate the problem during their examination. Help!.

I was coming back from my first oil change from crown Lexus dealer. I was pulling into a parking space and the car would not stop even when my foot is on the brake. I tried to steer away from the concrete wall in front but the front left side still hit the wall. The car was damaged and the wall is damaged. The cost of the damaged is 9,000-10,000. Right now is being fixed by my insurance company. The model of the car is Lexus Rx400h year 2008.

My Lexus rx400 h hybrid vehicle is experiecing smilar problem regarding the break like Toyota prius . When bumpy , down hill and ice road, the brake will experience temporary disable and the car will move forward. When braking on uneven or slippery surfaces, the braking system gets confused and braking power is lost momentarily.

When braking, any small bump, particularly on wet surfaces, causes braking to cut out for a second or two, and the car does not decelerate as fast. Added pressure is required to engage the regular brakes to resume the same stopping level. This non-linear stopping characteristic causes increased stopping distances and loss of control in braking (at least for a second or two). This seems to be caused by the regenerative braking cutting out when the anti-lock system engages momentarily.

The contact owns a 2008 Lexus Rx400h. While driving 25 mph and applying the brakes the lack of electricity in the battery caused the contact to apply excessive pressure to the brake pedal in order to stop the vehicle. Within minutes the brakes began to function normally since the battery recharged by pumping the brakes. The contact took the vehicle to the dealer twice for a diagnostic test and both times the dealer was unable to duplicate the failure. The contact is concerned that the failure could in the braking system could cause a crash to occur. The failure mileage was 22,000.

I own a 2008 Lexus 400h hybrid purchased as new last year. Almost immediately we noticed a problem with the brakes when stopping over bumpy surfaces -- it was almost as if the brake disengaged while trying to stop. We brought it back to the dealer, who assured us everything was working properly. They even brought in a national expert to evaluate and we again were told the car was working as it should. The problem has not gone away -- if anything it is worse -- and it appears to be precisely the same problem now being reported with the prius braking system. Toyota/Lexus basically ignored us when we complained and the problem is not fixed. It is of major concern and has been since we bought the car. It is a replacement for a previous 400h that was totaled in an accident, and the previous car did not have this problem.

Brakes. Loss of braking capability while traveling over an uneven road surface.

May 2008: purchased 2007 Lexus 400h SUV. Car great except brakes. Something was odd. June 2008: sent the car to the dealership to check brakes. They insisted everything was fine. My discomfort was due to my inexperience with the regenerative braking system. I tried to get used to it. It seemed to get worse over time. At around 10 mph, the braking momentum changes suddenly. The car floats briefly then surges a little. It was unclear if it happened all the time, or only with gradual braking, or only when stopping from a slow speed. July 22, 2009: accident. Brakes suddenly stopped working as I turned the car into a parking space behind another car. I panicked when the car didn't stop at the expected point. I slammed on the brakes, my foot slipped and I hit the accelerator. I hit the car in front of me sending it toward three other cars. This would not have happened if the brakes worked properly. August 2009 -reported accident to the dealership. I was told to talk with Lexus headquarters in California. They arranged for a field agent to go to the local dealership. September 30, 2009 - car at the dealership for everyones review. Afterwards, told by phone that no problems were identified and the car was safe. I wasn't comfortable with that decision. On November 27, 2009, I took the car in again, insisting there was a problem. I drove with the service manager. He admitted he felt the floating/slight surge. He claimed it was the moment between the end of the "regenerative" braking system and when the conventional braking system kicked in. Not happy with the explanation. The floating/surge means you're not quite sure when you will stop. On January 6, 2010, I received a letter from Lexus. Their field technician inspected my car, found nothing wrong and the accident could not be related. I do not agree. Now I hear about Lexus hybrid brakes problems and I assume its what I've complained about all along.

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The contact owns a 2006 Lexus Rx400h. The contact stated when driving at speeds of at least 40 mph on a bumpy road surface, the braking system becomes faulty causing unpredictable stopping distances. The contact took the vehicle to a dealer to have a diagnostic test performed and the dealer was unable to duplicate the failure. The contact was concerned that the vehicle could potentially cause a crash due to the faulty brakes. There were no repairs made to the vehicle. The failure mileage was 52,000.

I have a 2006, Lexus, RX 400 h. A Lexus certified used vehicle. The vehicle was new to me last summer. It accelerates slightly when I initiate braking 2 or 3 times out of 20 times. I thought it was "normal" for a car with regenerative braking. It startles you when it happens but hard pressure on the brake stops the car. You have to pay atttention each time you brake. What is scary is it accelerates a lot in about 1 of 100 times when I brake. At first I thought I was hitting both the gas and the accelerator . . . But I am sure I am not. The car will accelerate two car lengths before you can brake it. I thought it was dangerous and brought it to the dealer last year. We went for a test drive and the problem did not occur. The dealership recorded the complaint and told me to keep an eye on it. The 2 car length acceleration problem was worse in the hot months and it did not seem to occur in the winter months. The slight acceleration problem has not changed in frequency. With all this Toyota brake stuff, I wonder why I have not heard of this problem in Lexus hybrid cars too?.

Brake fade during slow and steady application on Lexus 400h 2007 dealer has not responded well to this complaint this is an ongoing problem.

Lexus Rx400h has a brake issue. Instead of stopping it sometime accelerates and continuous braking leads it to stop. The hybrid technology forces many of us to change all four company fitted all four tires just in 2 years. Very disappointed by paying premium for premium brand but not getting premium quality!.

While driving at low to moderate speeds in my Lexus Rx400h, there is a hesitation in the brakes. It seems to occur in the change over between hybrid regenerative braking and normal hydraulic braking. I rear-ended a car in stop and go traffic due to this issue. I reported this to my local Lexus dealer on two occasions, but they found no problems.

I have a 2007 Lexus 400h hybrid. I was coming up behind a car coming off the interstate. The car ahead of me slammed on their brakes. I slammed on my brakes. The brakes worked at first then they let up and then kicked in again, but that delay in between caused a lunge into the car ahead of me causing an accident. I have been complaining to Lexus about this issue for a year. They say my brakes are fine, but now that I see all of these recalls I realize they may be trying to cover up the issues with their hybrid brakes. I think that all of their hybrid brake systems need to be examined for this delay between the two brake systems.

I have a 2006rx 400h, with 60k miles, and an extended warranty. I broke down 2 weeks ago on a 2 lane highway, without brakes, loud warning sounds, and failure lights all over the dash. My choices at that time were to stop in the middle of the road, center divider did not exist but instead was a concrete barrier, and right hand shoulder eased off to the river. Since it was not commute time, traffic was light and I was able to slow down and pull off at the old mare island base in vallejo. My car was towed to freeman Lexus, santa rosa, where I bought my car and have had all servicing done. I was informed that the computer needed to be replaced and would take a week or so to get. The job was done on wed. Feb 11. I went to the dealership to pick it up and was on my way to sf to teach a class, when less than 30 miles from the dealership, on highway 101, in the middle of commute traffic, failure alarms and lights sounded and brakes did not work. I was shocked and tried to quickly get my car over to the slow/right hand lane and tried to slow down. I finally, 2 miles later, found an exit ramp and brought the car to a stop after a long approach to the ramp. I was stopped between the lane and the shoulder. Called the dealer again to let them know of the failure. They now have the car towed back at freeman Lexus. If this computer was replaced, how could this failure happen again. Additionally, I had to reach out to all my students to cancel the class at the last minute. This is a catastrophic failure and both times could have ended in injury, serious collision, to others or myself. While I have always been delighted with this vehicle and Lexus products and service, I do not know what I could be told regarding the repair of this car, that would make me feel safe. I feel like with these 2 failures, two potentially serious situations were averted. How can I be sure that this won't happen again with terrible or deadly consequences?.

I own a 2006 Lexus RX-400h, and I have experienced braking problems while driving this vehicle for the past 1-2 years that has become progressively worse. The problem generally occurs at speeds between about 25-45 mph, and involves a sudden decrease in braking deceleration with constant brake pressure, making it necessary to quickly apply more pressure to bring the car to a stop. From my own observations, as well as from technicians at the dealership, this problem appears to be related to the hybrid regenerative braking system, which seems to abruptly stop regenerative braking without compensating with additional friction braking. After finally having this phenomenon confirmed by the dealership after over well over a year of experiencing it, I am being told by the dealership that Lexus engineers are calling this "normal" and "expected" behavior of the car. I am filing this complaint because I feel that, while it may be "normal" or "expected" to Lexus, it presents a serious a danger to myself and other drivers when the vehicle does not respond to braking in a predictable manner. I have on several occasions been startled by occurrences of this problem when approaching a stop sign or cross walk, and consider myself fortunate that I've been able to react in time to avoid hitting the vehicle in front of me, or a pedestrian. This problem has become severe enough that it can be fairly easily reproduced in the first few minutes of test driving.

The road was snowy and slippery, but not icy. When the vehicle about 50 feet ahead of me stopped for the traffic light, I applied the brakes, but to no effect. My vehicle did not slow, and I didn't hear the noise of the anti-lock brake system. I chose to go off the road and hit a pipe railing rather than the tanker truck that was stopped in front of me. Other vehicles at the same location had no problem stopping. Copies of my correspondence with Toyota are available. Toyota only road tested the vehicle on dry pavement.

The contact owns a 2008 Lexus RX 400h. Whenever the contact applies the brakes while traveling over a rough surface the brakes will disengage allowing the vehicle to still move forward. The vehicle was taken to the dealership where the contact was informed that the vehicle was operating as designed. The contact has noticed the failure since the day she purchased the vehicle. The current and failure mileages were 16000.

The regenerative brakes on my Lexus RX 400h will stop working during normal braking operation causing the operator to have to apply more pressure to the break pedal to compensate for the loss of regenerative breaking. This is an intermittent problem and you never know when you will have to make a braking adjustment. This problem first started in December, 2007. I purchased the car in April, 2005. I do not feel that an operator of a vehicle should have to make sudden adjustments in their breaking action to compensate for the disengagement of a portion of the breaking system, especially when you never know if it is going to happen. I have taken this back to the Lexus dealer on several occasions and they tell me that they believe the car is working normal, even when the problem is intermittent.

I was approaching a light intersection at 50mph. When light changed to red I tried to apply brakes about 1,000ft from intersection. Car did not slow down and brakes appeared not to be working. I veered into median to avoid stopped traffic in front of me and then entered intersection clipping the back of another vehicle. Lexus dealer reported no defect with brakes. This vehicle had been stored in a florida garage and it was the 1st time it had been driven in several months. This has not happened again to this vehicle to my knowledge.

Inconsistent brake feel during slow and steady application of brakes when going over a bump in the road. This scares the heck out of me.

Vehicle was normally maintained and lightly driven. One year of age of the vehicle, when driven on level dry surfaces, the braking of the vehicle became erratic and remains erratic. In everyday use the vehicle will tend to overbrake or underbrake depending upon the mechanical loading of the hybrid drive. The onboard firmware is not properly accounting for integrating the stopping power of the brakes and the hybrid drive. This causes driver confusion and in some cases hazardous failure to brake conditions when the hybrid drive unexpectedly and erratically ceases it's contribution to the braking force of the vehicle. I. E. If the driver does not immediately compensate, the vehicle will lunge forward at low speed and within a few feet of pedestrians and other stopped vehicles in traffic. The dealership states that nothing can be done and that erratic/loss of braking is normal for this model. There are no recalls or sbs posted to upgrade the firmware, braking/hybrid drive systems. Lexus Rx400h, 2006 model.

Lexus Rx400h, accelerated while brakes were applied causing an accident. Also the vehicle's brakes were such that the there was a slight delay that had to compensated for or you would pass intersections or turns. The vehicle still accelerates at times when brakes are applied.

When braking, if a pothole or bump in the road is hit or when either the temperatures are really cold (on occasion) or the hybrid battery charge is close to full, the car's regenerative braking stops and there is a delay in the friction brakes being applied by the system. When this occurs, the car seemingly jerk forward for a second. Dealer stated that there is nothing wrong with the brakes. This behavior has recurred over the last 4 years/60,000 miles. No fix from Lexus. Had to learn to expect this behavior and drive accordingly (on occasion having to emergency brake with abs activated).

The vehicle actually accelerates or lunges forward when I step on brake and am braking over uneven part of the road.

Brakes slip on my Lexus 400 hybrid SUV, 2006 model. This occasional slippage has always been a part of this car since I bought it. I have brought it to the dealers attention and they say they could not find anything wrong. These incidents have continued to happen from 2006 purchase date until the present, 2010.

Ever since I purchased the car in late 2005, my 2006 Lexus RX 400h hybrid SUV will lose braking effort when going over a bump. I have press harder on the brake pedal to maintain braking force to stop the car when this happens. This happens every time you go over a certain type of bump when the brakes are being applied. There is no light or warning sound associated with the loss of braking effort. If it possible to safely remove your foot from the brake pedal or a second, and then re-apply the brakes, the brakes are restored to normal operation. Vigilance is required in increasing brake pedal pressure when this happens to avoid a crash. I have to complained to several Lexus dealers and to Lexus central customer service about this issue. I was told the company never received any complaints about the problem and/or was never able to reproduce the problem in my car.

I own a Lexus Rx400h 2006. On several occasions, the vehicle has lurched forward (I. E. Accelerated) before stopping when I applied the brakes at a red light or stop sign. I went to the wilkie Lexus dealership in haverford, PA on January 31, 2013. A technician performed a test on the vehicle and reported normal braking performance. I have found similar complaints on NHTSA. Based on these similar reports, I believe my vehicle is not an isolated incident. The brake system on this model needs to be investigated. I will also file a formal complaint with Lexus. I have been lucky to not hit a pedestrian or vehicle, however, it seems as if it is only a matter of time. Others with similar incidences have not been so lucky.

S10 appropriate handling re Toyota recall for prius brake issue, owner of a 2006 Lexus 400h concerned with braking problem experience w/vehicle. The consumer stated the vehicle would continue to accelerate when the brakes were applied. The incident would occur when driving at higher speeds and then slowing down to stop.