really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
30,414 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2006 Lexus RX 400h brakes problems

brakes problem

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2006 Lexus RX 400h Owner Comments

problem #13

Apr 202010

RX 400h

  • 63,105 miles


Lexus Rx400H 2006 - ABS - when applying brakes to slow down, if the car is on a bumpy road, the brakes seem to give out and the car lunges forward. This seems to happen as car switches from regenerative braking to regular brakes. I have reported this issue to the dealer several times, and they have yet to find any problem.

- Chicago, IL, USA

problem #12

May 232009

RX 400h

  • 32,000 miles
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?

- Eagleville, PA, USA

problem #11

Mar 012010

RX 400h

  • 40,000 miles
We own a 2006 Lexus rx 400H and occasionally when the brakes are pressed the car 'jumps' forward. We have taken our vehicle to the Lexus dealership several times to report the issue but they always return and tell us nothing it wrong with the vehicles braking system. This event does not occur all the time, we are concerned that if we are required to stop suddenly to avoid an accident, etc. That our vehicle will jump and we will cause an accident.

- Kansas City, MO, USA

problem #10

Jan 102010

RX 400h

  • 25 miles


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.

- Staten Island, NY, USA

problem #9

Feb 112010

RX 400h

  • 76,000 miles
I own a 2006 Lexus Rx400H which I believe has exactly the same flaw as recently reported in the prius. Several years ago I had a minor accident caused by my car lurching forward during breaking which caused me to hit the car in front of me. When I brought my car into the Lexus of watertown dealership where I purchased the vehicle I reported that I thought the issue might be related to the transition between the regenerative braking system and the regular brake. It seemed like the regenerative braking system was turned off slightly before the regular braking system kicked in causing a gap in the braking that was perceived by me to be a "lurching forward". of course, what it was a decrease in deceleration that appeared be acceleration. In any event, the dealer said he checked the brakes and could not find anything wrong. I would say from that time until now I had about one or two instances of this lurching per month. I am very used to hybrids and currently own a prius as well, so I know the idiosyncratic nature of the braking system. However, after the recent cascade of reports on problems with the prius I called my dealer again and told them, you should know that the Lexus has the same problem, I have had exactly the same problem with my Lexus have there been any other reports of problems. I believe I was told no, however, the wording of the answer was guarded. Today, I had another lurching event. Approaching a stop sign, on a smooth, dry road I lurched forward at approximately 15 mph. If a pedestrian were crossing the street at the time I would have hit them, causing serious injury, hopefully not death. This is a dangerous situation. I contacted my Lexus dealer to relay this issue today and say we must do the right thing. They did not respond, so I am moving forward with this formal complaint before more serious harm is done.

- Wayland, MA, USA

problem #8

Jan 282006

RX 400h

  • miles
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.

- Hickory Corners, MI, USA

problem #7

Feb 072010

RX 400h

  • 30,500 miles


I own 2 2006 Lexus rx 400 H hybrid SUV's. from the first week I complained that the brakes would not always engage when you depressed the brake pedal. The car would lurch forward when the brakes did not engage for 1 or 2 seconds. The Lexus dealer has dismissed my complaint each time. Now there appears to be a voluntary recall of Toyota hybrids and one line of Lexus hybrids with the identical problem. But the problem is not just with their new S50 Lexus hybrid. It has existed at least as far back as 2006 with my cars.

- Coral Gables, FL, USA

problem #6

Feb 012010

RX 400h

  • 36,500 miles
I went to the dealership last morning of Feb 3 2010 for my regular serivice. I didn't know yet that time about the story behind the break time lag of prius. Because that day I told Lexus to take a look on my brake as I am having the same problem as the prius. My car is a Rx400H 2006 model. Not only I'm having the same problem during slow movement(approaching the traffic light) but even on a high speed(60-65). I compalain the problem to Lexus 3 years ago and they did some adjustment(I don'Y know what exactly is) but still I always have that problem at least once or twice a month. Mywife is the one who drives that car a lot, and she told me that she never have that episode on a high speed, but she said she always have that on a 50mph speed on a local strret, which is even worst, as the car in front of you are very close. Actualy last Feb 3 2010 the Lexus gave me a loaner car for that day and it is a hs hybrid car(450 miles) and it's almost new, and I was surprised that it has the same problem when I'm approaching the traffic light. So I told myself, is this normal to a hybrid? my Rx400H is now 4 years and I cannot remember I'm having that problem on it's 1st year. I believe the slow speed was started a month ago.(mid Jan 2010) and the high speed is probably 3 years now. This message is not a complain, but rather them(Toyota) to investigate if everything is still normal.

- Aliso Viejo, CA, USA

problem #5

Dec 112009

RX 400h

  • 35,000 miles
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.

- Toronto, 00, USA

problem #4

Jan 302010

RX 400h

  • 50,200 miles
2006 Lexus rx 400 at slow speeds steps on brake and nothing happens for about 2 - 3 seconds. This has not caused an accidents as I have allow enough space for brakes to respond. This does not happen with any pattern and is difficult to predict when it will happen.

- Newark, DE, USA

problem #3

Nov 172006

RX 400h

  • 50 miles


I have been complaining of this same problem (my brakes fail also when going over rough roads) since I bought my 2006 Lexus Rx400H. They have been telling me its normal and deny its even a problem. Eb. 4: NHTSA today announced it is opening a formal investigation of the Toyota prius hybrid model year 2010 to look into allegations of momentary loss of braking capability while traveling over an uneven road surface, pothole or bump. The Agency received 124 reports from consumers, including four alleging that crashes occurred. Investigators have spoken with consumers and conducted pre-investigatory field work. 'safety is our top priority, ¿ said transportation secretary ray lahood. ¿that is why in recent weeks NHTSA has also issued a consumer advisory on the recall of several models of Toyota vehicles and the Pontiac vibe involving pedal entrapment and sticky accelerator pedals. We will continue to monitor these issues closely.¿ news release.

- Massapequa Park, NY, USA

problem #2

Apr 032006

RX 400h

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

- Phoenix, AZ, USA

problem #1

Dec 102007

RX 400h

  • 32,000 miles
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.

- Simi Valley, CA, USA

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