This morning on my way to work I had a moose jump out in front of me. I have fairly fast reactions to this since it has happened a couple times in other vehicles I have had. The issue thou is the fact that the prius just doesn't want to stop. It has its "antilock brakes" that drive me crazy. When I slammed on the brakes at 35mph it took almost 200ft to stop. The road was just recently paved and it wasn't raining. I should have shat my pants but I didn't. Luckily the moose moved but my heart was racing. After that little incident I was a little shook up. Later on in the day I was on my way to a show and traffic went from 45 to 0 in a heartbeat. I had plenty of room to stop at but obviously my car didn't think so. I ended up on the median to avoid the guy in front of me. Is there something wrong with my car or am I just too nervous? I really love my prius but if I have to go thru this again I will sell it. I know I am young a should be able to handle it but it is really is driving me crazy! Any Suggestion???
Something is wrong with your car, take a tech for a drive, that isn't normal. ABS shouldn't extend your stopping distance on a good surface. Can you feel the ABS working? Is it pulsing under your foot? Are you holding your foot down hard even when this happens or are you lifting your foot? You must not lift your foot when ABS works, hold the pedal down HARD! It is a really good idea to practise this on a dirt road. While braking as hard as you can try swerving around an imaginary object, you will see why ABS is a good thing. (Oh my god, did I just say that? 2 years ago I hated ABS!)
I am fully depressing the pedal almost thru the floor. No pulsing at the pedal. The car slows down then releases then slows down again. Brake-no brake-brake. It like lunges forward almost.
From 35 to 0 in 200 ft is not acceptable. I've seen car after car on Motorweek go from 60 to 0 in 120 to 140 ft.
35MPH and 200ft, something's definitely wrong there! That equates to an average deceleration of only 0.2g. It should be at least four times higher than that! You really need to get the brakes checked asap.
To recap, you were driving on a recently paved surface, no water or ice on the road. A few questions: How many miles on your car? What tires are installed? What is the tread depth, especially the front tires? What tire pressure are you using? If you were braking on a bumpy surface, I could believe that the braking would temporarily suspend as the front tires lose grip. However I haven't heard that this happens on a smooth surface. I'm wondering whether you need new tires. The original equipment Goodyear Integrity tires are not known for outstanding traction and grip, especially once the tread depth is a bit worn down.
Just to clarify, the Prius will not exhibit a pulse sensation through the brake pedal like a typical car when ABS is activated. Hmm... that certainly doesn't sound right.
smartalec89 ... did you measure out 200 feet, or did it just seem like a looooong stopping distance? my prius doesn't pulse, and stops pretty darn whip fast i'm always slamming the brakes, 'cause i'm usually browsing porn on my iphone between stoplights, and on traffic on the 405, and whenever i look up it's time to slam on the brakes quick anecdote it was the 80's, thanksgiving, i was visiting my folks, and mama had a new acura, first generation, the smaller sportier one i had my great uncle and aunt, real old, like eighty-something, in the back, and my gf, city girl, in the front alongside me great uncle and aunt had to got back to NYC on the amtrack we're heading to Philly, backroads, and i'm BLAZING down conshohoken state road twisties, downhill, through the woods, in the dark ... fun stuff i come around a curve, and there's a mighty buck, and i mean mighty, straddling the double yellow, blocking a fair portion of each lane, eating grass or weeds sprouting through the pavement daaaaaaamn!! i stand up on the brakes, i've got the steering wheel in my stomach, my face against the windshield, but all i feel are thump-thump-thump-thump from the wheels i figured i'd lock 'em up, tires would smoke and scream, mighty buck would bolt, and i'd pull out of the slide and take whichever lane the buck stepped out of but no ... thump-thump-thump-thump ... which i'm taking for brake failure 'cause i've NEVER driven a car with ABS man, that little acura stopped with no room to spare, i'm telling you, the bumper was under his belly, legs on either side of the car ... he was that big ... then he turns, leans in close and looks right in the windshield my heart is in my throat, i'm scared it's gonna fly out of my mouth and mighty buck licks the windshield, and my ancient city slicker great uncle hollers "look at the size of that dog"
Aside from the Moose lncident, there is one sure fire fix, change your driving habits to accomodate the braking problem, IF, there is a braking problem. The moderator, Dr Efusco recommends doing the speed limit. The California Drivers Handbook for Seniors actually says the driver should leave a Quarter mile following distance! Both these habits will insure great mileage too. Also getting into habit of putting the gear selector into the BRAKE position when slowing down also helps alot, Altho the Prius freewheels fairly well (in drive) it doesn't compare at all to my wifes Honda. Because of the regeneration the Prius instantly starts slowing down when when off the GO pedal. Incorporate this fact with the BRAKE position and the driver hardly ever needs the foot brake. First you have to analyse IF there really is a problem.:welcome:
in a panic stop, i would not have the wherewithal to be able to calibrate my stopping distance and i have great admiration for you if you can. my suggestion is... do it again. unless its repeatable, its not a problem. any diagnostician will tell you the same thing. go back to that road, get up to 35 mph, find a landmark, as soon as you get there, slam on the brakes. put in park, preferably after the vehicle comes to a stop. get out and pace it. have done this many times...because friction brakes can easily go several days with little or no use, i do this to both Pri's once every other month or so just to brush the rust off. at 35 mph, my average stopping distance is like 40-50 feet. but in a non emergency situation, i am taking out reaction time. add something for real life situations. let us know what you get
Frost, dew, bumps, dirt, sand, bald tires, panicked time compression. But yes, I would have a dealer test them to make certain.
You don't need to slam on your brakes to clean off the rust.... just get up to 30, shift into N and apply brakes normally... you don't need to finf empty roads etc for this to work.
Thank you everyone! I will try the brakes again on the same roads soon to see if it has any issue. It may not have been 200ft but it was atleast 100ft if not more. I haven't been driving the car since this but I will double check. I'll let you all know what happens!
1) New tires always brake and handle a little funny. That's probably contributing to a legitimate effect. 2) Why 32psi? Even the placard pressure is higher than that, and placard pressure is generally considered to be on the low side.
Well I took it to get its oil changed right after the tires were put on and they determined 32psi was best. I plan on raising it after it snows and I test them traction wise. I ran the integrities at 40psi last winter and did fine. I am not sure about the studless tires since I have never used them before.
Alright the debate is over. I went to the same spot in the road and slammed on my brakes to see if they worked. Sadly enough they didn't work out that well. I measured from commencement of breaking point to where I stopped. The distance was 75 ft. I was traveling at 40mph when I slammed on my brakes this time though. This wasn't too great so I turned around and headed for the dealer. After having them take a look at it they found my front brake calipers had been "locked out". They fixed it and now it works lots better! My question for all of you is have you ever heard of brakes being "locked out"? Thanks, Smartalec89