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Toyota Prius Brake Problems

81 messages,  Last post on Nov 27, 2009 at 10:44 AM

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What is this discussion about? Toyota Prius, Brakes, Hatchback, Sedan

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#71 of 81 Re: Prius Brake Issues [pjackie] by whitey9 Sep 30, 2009 (10:49 am)
Replying to: pjackie (Sep 20, 2009 2:46 pm) Check the floormat on the driver's side and make sure it isn't bunched up thusly not allowing the brake pedal to fully depress, or the throttle ( gas pedal ) to fully release. There is a recall in progress for floormats. Priui from MY '04 - '09, I believe. Replies to this message: jacquesc (Sep 30, 2009 11:57 am) whitey9 (Sep 30, 2009 2:24 pm)
#72 of 81 Re: Prius Brake Issues [whitey9] by jacquesc Sep 30, 2009 (11:57 am)
Replying to: whitey9 (Sep 30, 2009 10:49 am) There is a recall on the floor mats? That being true or not. You are absolutely ridiculous for thinking that the problem originated from my floor mat being bunched up.That would have been painfully obvious if that were the case. My floor mat has never budged from the position it was in when I bought the vehicle. The hooks at the back of the mat (nearest the seat) work very well as intended to prevent that from happening.   I'm not sure if you people that right with alternate ideas for the problem are sincere, or work for Toyota. Because every idea seems to be misleading and in an attempt to redirect the consumer of the true and costly imperfection in the make of car.   If you are truly attempting to help in a legitimate way... thank you for your input. Replies to this message: whitey9 (Sep 30, 2009 2:24 pm)
#73 of 81 Floormats by whitey9 Sep 30, 2009 (1:09 pm)
That's what the Lexus' occupants thot when they made an emergency call on their "On-Star" to see what could be done with their "runaway" car speeding down the highway at 120+mph. They said the brakes did not work, and they were unable to stop the car.   Only 1 person died in the resulting crash, a bystander.
#74 of 81 Re: Prius Brake Issues [jacquesc] by whitey9 Sep 30, 2009 (2:24 pm)
Replying to: jacquesc (Sep 30, 2009 11:57 am) Without being overly coy, the purpose of bumpers on cars is when something happens that is not expected, or that does not normally occur. What I am trying to say is not everything that happens, necessarily happens on purpose. Stuff happens.
#75 of 81 Prius slides on wet roads by gghol Oct 02, 2009 (6:41 am)
My 2008 Prius slides when I brake on wet roads. It's scary. Has anyone experienced this? Is it the brakes or the tires? I only have 21,000 miles on the car. Replies to this message: whitey9 (Oct 02, 2009 8:33 am) vspin1 (Oct 04, 2009 8:38 am) oxyman (Nov 26, 2009 10:44 am) hal_cat (Nov 27, 2009 5:15 am) jacquesc (Nov 27, 2009 7:42 am)
#76 of 81 Re: Prius slides on wet roads [gghol] by whitey9 Oct 02, 2009 (8:33 am)
Replying to: gghol (Oct 02, 2009 6:41 am) Slides? Or drifts ( sideways )? Steering sharply while braking? Tire pressures OKay? Tires not worn? Too much speed? Braking too late? Any function/malfunction lights illuminating on the dashboard?
#77 of 81 Re: Prius slides on wet roads [gghol] by vspin1 Oct 04, 2009 (8:38 am)
Replying to: gghol (Oct 02, 2009 6:41 am) I have had this happen on more than one occassion on my 2007 Prius. I had to brake hard when a vehicle cut in front of me to make an unexpected turn, but it felt like the brakes never engaged. I hit the vehicle that cut me off, which caused no damage to his pickup truck, but about two thousand dollars worth to my Prius. I have contacted my dealer, the main Toyota company, and have spoken with a rep. Basically they sy that it needs to be documented by my dealer in a road test, but trying to simulate this is nearly impossible. I have new tires on the car, and it happened to me again about a week ago. I feel its a combination of ABS sensitivity, and the lack of weight of the car which causes this problem. . . but I can't prove anything at this point. Replies to this message: oxyman (Nov 26, 2009 10:44 am) hal_cat (Nov 27, 2009 5:15 am) jacquesc (Nov 27, 2009 7:42 am)
#78 of 81 Re: Prius slides on wet roads [vspin1] by oxyman Nov 26, 2009 (10:44 am)
Replying to: vspin1 (Oct 04, 2009 8:38 am) Success!!! Got it to happen without causing an accident. After reading all of these messages I decided to try this with our 2007 Prius. I've never put the car through its paces until I heard news of a recall. I didn't need wet conditions like reported on this site, just going down a hill over a speed bump at about 22-24 mph I slammed the brake and the car did not stop normally on first try. I'll need to videotape this to figure out how long before the brakes acted normally, but I experienced about 1 to 2 seconds of weak braking before I felt normal brake action with the car finally coming to a halt.   I was also able to replicate in an empy parking lot in a spirited turn at about 20 mph. Every panic (stomp the brake like your life depends on it) brake application results in extremely weak braking action. When I hit the brake less violently the car stops normally under control also.   I did not feel the ABS pulse in any of these tests until the last few milliseconds before the final stop. The anti-skid light came on in many of these tests so I suspect that the system is overriding my panic stop. In my mind this is clearly caused by a system (software & hardware) malfunction, or design flaw, not mats, hitting the wrong pedal etc.   While my tests were certainly not standard I you should know that I have experience autocrossing with the Porsche Club of America and know how to test a car and see how it should react to driver inputs. In my mind there is no question that the Gen II Prius could be deadly in a panic stop. While I would be comfortable in my ability to handle a panic stop in this car I would gauge it as being dangerous for general public use until Toyota reprograms or redesigns the braking systems.   My next step is to contact Toyota and find out if they have a solution. Otherwise I will have to video tape my tests as evidence should it be needed. Replies to this message: hal_cat (Nov 27, 2009 5:15 am) jacquesc (Nov 27, 2009 7:42 am)
#79 of 81 Re: Prius slides on wet roads [oxyman] by hal_cat Nov 27, 2009 (5:15 am)
Replying to: oxyman (Nov 26, 2009 10:44 am) Please forward your comments and test results to the National Highway Traffic Safety Board. There needs to be corrective action and a recall before someone is killed by malfunctioning software. (I don't believe the problem is mechanical).
#80 of 81 Re: Prius slides on wet roads [oxyman] by jacquesc Nov 27, 2009 (7:42 am)
Replying to: oxyman (Nov 26, 2009 10:44 am) Fantastic job on the testing. I have performed similar tests which resulted with the same conclusion. I was appauled with the attempt to create a campaign to pitch the problem being the floor mats. Almost as if they had planned it from before the vehicle release. I have attempted to contact Toyota and the National Highway Traffic Safety Board -- but, have not yet recieved a repsonse.   Please continue your exposure of this plight with aggression...

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