Last post on Sep 03, 2013 at 5:22 PM
You are in the Toyota Prius
What is this discussion about?
Toyota Prius, Brakes, Hatchback, Sedan
Go to NHTSA to file a safety complaint.
Or call Monday-Friday (8 am to 8 pm ET) (888) 327-4236 TTY: (800)424-9153
#315 of 370 Re: Prius brake problem fix [cgolliher]
Feb 24, 2011 (6:03 pm)
For those of you that don't know, Toyota changed the brake system for the 2010 model year to a completely new design. You can't compare it with previous model years as the system works differently. I have driven the 2010 Prius before and after the software "fix" and agree the problem was not fixed. I also think it is interesting that there are over 800 brake related complaints filed at NHTSA for the 2010 (over 600 after the software recall) and yet there are 0 complaints for the 2011 model year. Obviously, Toyota knew there was a problem and fixed it with the 2011 model year. With all the customer complaints, I don't understand why NHTSA has not taken action. Maybe a class action lawsuit is needed.
#316 of 370 Re: Prius Brakes issue [smt1]
Feb 27, 2011 (11:00 am)
I read that they redesigned the braking systems for the 2010 Prius. That appears to be Toyota's response to the fact that the U.S. Generation 2 Prius (2004-2009) has had low-speed brake failures reported to the National Highway Traffic Safety Administration (NHTSA) at 31 times the rate of such failures reported for the 2004-2009 Corolla, which of course has traditional brakes. reliable cars
#317 of 370 Re: Prius Brakes issue [kingrob84]
Feb 27, 2011 (11:35 am)
So....what's your point? The Prius 2010's alleged brake failures are well known in reports, but not proven by any skeptic or compromised party to be "electronic" or software.
And then there was the software patch for 2010's "surge" issue that does not work for me or many others.
The interesting thing would be if the "Prius 2011" brakes are any different than the 2010s.
#318 of 370 Re: Prius Brakes issue [masterpanda]
Feb 27, 2011 (1:32 pm)
The basic design of the 2011 brake system is the same but you don't know what they may have done internally to the parts or software. The Toyota service part number for the 2011 is different than the 2010.
#319 of 370 Re: Prius Brake issue
Feb 27, 2011 (9:38 pm)
How do you recreate this brake problem? ... speed, road surface, weather, braking force (heavy, medium, light)
It took over a month of trying before I was able to recreate the original brake pause. After the flash, I was unable to recreate it. This doesn't mean the flash cured all brake problems so I'd like to try and recreate any current symptoms.
#320 of 370 My 2010 Prius still surges after fix.
Jan 27, 2011 (7:19 am)
#321 of 370 My 2010 Prius still surges after fix.
Jun 02, 2010 (9:43 pm)
My prius is still surging even after getting the fix. It spends most of it's time in my garage since I have two young children and don't feel like it is safe. Today I sent yet another complaint about yesterday's surge to the NHTSA and decided to search to see if others are still having the same problem. I found many complaints post fix.
We tried arbitration, but got nowhere. We have taken it in multiple times. I know Toyota maintains that it is safe, but I don't agree. I have had several people explain the way the brakes work, but a surge is still a surge. I drive slowly and take my foot off gas way before stop light, but what I can't control is when on a fast road and am cut off and then the person slams on their brakes. I tried to trade it in, but I will lose more than $12,000 on a car that is less than a year old. I know cars depreciate about 20% in the first year, but that is almost a 40% depreciation. Now I am stuck with a car that I don't think is safe! I am calling everyone from media to senators and hope that I get some traction. From NHTSA and other forums I know that I am not the only one experiencing this problem. One way or another this issue must be resolved!
#322 of 370 Re: My 2010 Prius still surges after fix. [betsyr]
Jun 15, 2010 (9:20 am)
Life is a series of compromises.
You wanted a hybrid, highly fuel efficient, car. That can't happen without regenerative braking to recover energy that would otherwise be lost to heating of the brakes. So the frictional brakes MUST be disabled at times, random times insofar as you are concerned.
As far as I know there is simply no way to make an easy and smooth transition, certainly not in all circumstances/situations, from pure/only regenerative braking to partial or even full frictional braking.
And by the way, what you are experiencing is NOT a SURGE but a slight lessening of braking effort. I just drove a 2010 Sienna for a full week and the forward lurch/"surge" due to the coastdown upshift after the engine fuel-cut period is just as noticeable in the Sienna as in the Prius.
My '01 F/awd RX300 has very much the same coastdown "upshift" lurch/"surge" as the speed declines below ~35MPH or ~10MPH. I noticed it at first, shortly after I purchased it new, but nowadays I find I must pay close attention in order to take note that it remains.
#323 of 370 Re: My 2010 Prius still surges after fix. [wwest]
Jun 15, 2010 (10:18 am)
I have a 2004 with 60,000 miles and have never had anything but a very slight surge.
The 2010 has disc brakes frond AND rear but that should not cause your problem.
Bring it to Don at Bighorn Toyota in Glenwood Springs, Colorado and he'll fix it for you.
#324 of 370 Re: My 2010 Prius still surges after fix. [stevegold]
Jun 15, 2010 (2:31 pm)
The 2010 Prius had a serious firmware design flaw wherein the ABS would "signal" the regenerative braking system that since wheelslip had been detected only frictional braking could, was to be, used. The problem was that somewhere in the back and forth communications between the two ECU's a disconnect occured and although regenerative braking would be discontinued accordingly frictional braking would sometimes be delayed, sometimes indefinitely, coming online.
Not just a slight lurch but seconds or more of virtually no braking effort.
Scary moments resulted.
Once you have endured a few of those moments even any little bit of brake "fade", "slight surge", common to the Prius, becomes a heart in throat event.