i had to dash-stop the Sonata today, like 35 to 0 mph, brake pedal fully pressed and the seat belt pre-tightened. i heard a sound from the front brakes and feel the bump thru the break pedal. it's serious and noticeable. wife heard it too. felt like i bumped over sth. it happened just before the car came to full stop. I tried to do it again to see if it was just the road. Same thing happened. It doesn't happen when braking from lower speed. even from higher speed, it doesn't happen if i don't press the brake really hard and fast. it got 25k miles on it and wife drives it primarily. i don't think its time for new brakes or machine the rotor thing. maybe it is???
aung2004
Yeah, that's your brake pads slamming into your rotor in an attempt to slow the vehicle without stopping the tires (while the vehicle continues to move).
I truly hated that sensation in my first ABS car, but as it has saved my *** once or twice since then, I've come to appreciate the feeling.
I truly hated that sensation in my first ABS car, but as it has saved my *** once or twice since then, I've come to appreciate the feeling.
Perhaps I'm mistaking, but doesn't ABS stop working around 10MPH or so. If you begin to feel something at fairly low speeds, I'd have the rotors checked out. They can warp over time and need to be...crap, I forget what it's called, but basically they smooth the surface back down. I know my fathers truck was really bad until he had this done. As he'd brake, the whole truck would shutter. My jeep is similar, but not nearly as bad as his truck was. I'm not sure if ABS causes the rotors to become more warped or not, but it can't help, as they "slam into your rotors", as mentioned above 
No, the ABS is suppose to start working at lower speed, just before the wheels are attempting to lock.
Eh...yeah...but there's another term for it. ****, I'll just have to drive up the street and check the sign out. One of the local auto shops advertises it
i'm confused. The car was going 30+ mph when the brake was applied hard. At that time, ABS is on, but might not be Active yet depending on wheel lock. If ABS turn off below 12mph, how come I felt that pulse right before the car stopped? It looks like ABS should be on if the brake is applied above 12mph AND as long as there's pressure on the brake pedal.
So, that big, nasty pulse right before the car fully stop is common? pls share ur ABS experience for learning sake.
So, that big, nasty pulse right before the car fully stop is common? pls share ur ABS experience for learning sake.
Originally posted by DarrenCax@Sep 26 2008, 02:44 PM
Eh...yeah...but there's another term for it. ****, I'll just have to drive up the street and check the sign out. One of the local auto shops advertises it
[snapback]192903[/snapback]
1. Resurfaced
2. Turned
3. Machined
They're all one in the same by the way.
That's it! I was thinking "churned", or something like that... "no...that can't be it..." :blush:
I know what you mean!
ABS may have saved my **** in a snow storm once...
I was following my friend in his Jeep cherokee on the Henry Hudson PKWY heading to downtown Manhattan...
Give or take halfway there, there is a series of undulations, the first being a sudden enough rise and fall to make your stomach tighten....
Anyways, knowing the road prertty well, I knew this is not the road to be speeding on in the snow..(road surface is crappy too.)
About 1/8th of a mile..not more than 10-20 seconds before the bumpy area, a Nissan Maxima flies by (flying is a relative term... I imagine he was doing ~50mph, while the rate of traffic was 20-30..(pretty bad snow storm..In fact, on my way home later that night the 30 mile home stretch had to be taken locally because they closed the highway..)
He passed and I didn't think much of it more than a, 'what an idiot'
Well what do you know, as we were going uphill my friend suddenly brakes and changes lane...(easier in his jeep I imagine, and with the benefit of being on an incline to help reduce speed)
Anyways, by the time he moved out of my way I was just peaking the hill.. and what do you know there is that same Maxima, wiped out and a lincoln town car with it....
I braced against the seat back and slammed on the brakes...knowing ABS would keep the wheels from locking up.
I can imagine that I would have wrecked my car that day If I didnt have ABS
( I almost got a Ford Mustand base model without ABS before I got the Sontata..)
Anyways, it felt weird as heck feeeling that pedal pulsing and the brakes grinding...
But it helped me slow my car in a safe manner and when I felt I slowed down enough I let off the brakes and tried to make a lane change ...but trying to slow down, and lane change in an orderly manner when closing in on a stalled vehicle on a decline during a blizzard is easier said than done... I put her sideways and kept it that way and the car grinded to a stop...no more than a few feet from the Max...as soon as I straightened myself out and got on myway there came a crowd of cars behind me and I could hear collision after collision....I'm lucky I didn't get sandwiched in there..
Anyhow.
whew I got a little sidetracked.
Your symptoms really sound like ABS at work..but apparently ABS doesn't kick in at 10mph...which I imagine it shouldn't..
This was a heart warming story about how ABS saved your life, until I read
"there came a crowd of cars behind me and I could hear collision after collision....I'm lucky I didn't get sandwiched in there.."
Yeah Wilayy you caused a multi Car pile up! :banana: Do you know in many
States if people slam into your disabled Car, you have an obligation to warn them,
and can be held liable for any accidents. Quite honestly I would not have thought
that to be the case. I mean you could be on your way to the Hospital, but your
Car until moved can still be a potential problem!
"there came a crowd of cars behind me and I could hear collision after collision....I'm lucky I didn't get sandwiched in there.."
Yeah Wilayy you caused a multi Car pile up! :banana: Do you know in many
States if people slam into your disabled Car, you have an obligation to warn them,
and can be held liable for any accidents. Quite honestly I would not have thought
that to be the case. I mean you could be on your way to the Hospital, but your
Car until moved can still be a potential problem!
G
Did you miss this part ?
Or are you saying something totally different ? I believe the Maxima was the one disabled in the road, along with the other car - willayyy was just avoiding it.
once when i was coming home from OH on a saturday afternoon there was bad traffic on the QEW ( always bad traffic on this main highway thru Toronto) and traffic went from about 80km/h down to zero within a couple hundred feet...i slammed on my brakes and prayed i wouldnt smash into the cobalt in front of me who was turning onto the shoulder to avoid me and at the last second i felt this thud like it was coming from the back of the car...a "bang bang bang" if you will, and the car stopped..i didnt hit him! ( 5 weeks after buying my sonata...my first car!) luckily there was noone behind me. the other time was in the morning one day...all of a sudden we came to a quick stop ( there was a cop in the right lane who had pulled someone over and i bet it was rubber-necking that caused it) but i slammed them on and felt that same sensation..the 3 cars in front of me all hit eachother but my sonata got away unscathed!
I have felt this sensation before in my moms tucson in the winter..its different though...whenever i would hit the brakes and it was slippery...it felt as though the brake was lifting back up against underneath my foot.
thank god for ABS...otherwise my car would have probably already been totalled...multiple times.
While I'm sure you are right if I am re entering the roadway, and then all the Cars
behind me smash into each other, it could have been me. In South Florida
parts fall off of Cars all the time, and you would be amazed what flies out of dump
Trucks. I had a Truck in Barstow that shot giant Ice cubes at me. :57:
But no I read his post wrong. :liebe011:
G
LOL, I ran over a box spring once in Shreveport that flew off the top of a car. In a lowered VW Bug no less. Wood went flying everywhere but no damage.
a little OT but when i was in the caribbean last month we hit a cayman ( relative of alligator & crocodile) in a little mazda 323. that was fun...and there was damage. poor animal
merging onto a san jose freeway at night with some traffic in the faster lanes....headlights show what looks like a CONCRETE block about 3 inches thick right across the lane....cars in left lane and wall on right....slam the brakes @ 60mph....thinking sonata is sure to be totalled.....car slows to 10mph...and amazingly the right wheel actually goes OVER the concrete block.....the concrete block is actually a mattress.....PHEW!!!!! ....speed up...and pray for the car behind me which slammed it at higher speed cuz he never even saw it.
My sonata escaped with not even a scratch.....
My sonata escaped with not even a scratch.....
lol wow a mattress on the highway...lmao. today i was sitting at a light with my friend and we see this truck pulling a trailer..large enclosed trailer, like a 18 wheeler type trailer...anyway the doors to the back of the trailer opened and a FORK LIFT just fell onto the road...lol everyone sitting there was like thats the craziest ive ever seen. the guy kept driving like he was going to not even reclaim it...lol too many witnesses i guess, he stayed. cops were there for hours. i can only imagine the fines....
thats the craziest ive ever seen. the guy kept driving like he was going to not even reclaim it...lol too many witnesses i guess, he stayed. cops were there for hours. i can only imagine the fines....Strikes me as odd that antilock is described as not engaging at 10mph. Stopping from 10mph on ice or wet leaves, for instance, would still cause wheel lock. Beyond that, speed is calculated on wheel rotation, so a locked wheel would report a speed of zero = car not moving, even though the mass of the vehicle is still traveling forward.
Being rear-ended by someone going 10 is still a damaging, whip-lashy and crappy experience. I don't know that I believe that "When the vehicle speed goes below 20 km/h (12 mph), the ABS turns off. "
Speaking of accidents! This is a bit OT but I never posted the impetus for my sonata purchase . . . antilock brakes definitely went off for this tragic loss of my Trusty Corolla, just paid off in May . . . [attachmentid=9609] [attachmentid=9610]
Damned lady was traveling south in a northbound lane. Gotta say, after that wasn't much interested in another Toyota - wanted safer; bigger; curtain airbags; traction control, etc etc.
Being rear-ended by someone going 10 is still a damaging, whip-lashy and crappy experience. I don't know that I believe that "When the vehicle speed goes below 20 km/h (12 mph), the ABS turns off. "
Speaking of accidents! This is a bit OT but I never posted the impetus for my sonata purchase . . . antilock brakes definitely went off for this tragic loss of my Trusty Corolla, just paid off in May . . . [attachmentid=9609] [attachmentid=9610]
Damned lady was traveling south in a northbound lane. Gotta say, after that wasn't much interested in another Toyota - wanted safer; bigger; curtain airbags; traction control, etc etc.
Attachments
And let's not forget...
As most drivers rarely or never brake hard enough to cause brake lock-up, and a significant number rarely bother to read the car's manual, this may not be discovered until an emergency. When drivers do encounter an emergency that causes them to brake hard, and thus encounter this pulsing for the first time, many are believed to reduce pedal pressure, and thus lengthen braking distances, contributing to a higher level of accidents than the superior emergency stopping capabilities of ABS would otherwise promise. Some manufacturers have therefore implemented a brake assist system that determines that the driver is attempting a "panic stop" and the system automatically increases braking force where not enough pressure is applied. Nevertheless, ABS significantly improves safety and control for drivers in most on-road situations.
As most drivers rarely or never brake hard enough to cause brake lock-up, and a significant number rarely bother to read the car's manual, this may not be discovered until an emergency. When drivers do encounter an emergency that causes them to brake hard, and thus encounter this pulsing for the first time, many are believed to reduce pedal pressure, and thus lengthen braking distances, contributing to a higher level of accidents than the superior emergency stopping capabilities of ABS would otherwise promise. Some manufacturers have therefore implemented a brake assist system that determines that the driver is attempting a "panic stop" and the system automatically increases braking force where not enough pressure is applied. Nevertheless, ABS significantly improves safety and control for drivers in most on-road situations.
As I understand it, ABS is NOT designed to allow better stopping in the wet/snow.
A locked wheel is not spinning, and the only wheel that can steer is one that's spinning. ABS, by its lock-spin-lock-spin gives the driver a SMALL measure of control over the vehicle.
The only time ABS helped me was on my Subaru. We'd had an ice storm overnight followed by snow. That crunchy white stuff underwheel was really slippery. Everyone was crawling along. I came to a red light and gently applied the brakes; Susie's ABS went nuts and I fishtailed a bit. I decided it was less dangerous to run the light and risk getting hit than spin so I lifted my foot from the brake and wiggled thru the intersection. Fortunately the BF truck on my right realized what was happening and let me thru. Susie wiggled her way out of the intersection and down the block; her tires bit after about 50 feet after the intersection. Susie was a Legacy GT with AWD, 4-wheel ABS and 4-wheel Traction Control. While this had little to do with ABS per se, (it was the TC) TC is usually implemented by using the ABS.
I don't know what the BOOK says, but MY experirnce (mostly braking on snow, or water, or sand/gravel), and I'm sure others' is -- ABS would work in low speeds too.... (12 mph IS a very low speed, you know). At least our Sonata's ABS would.
Bottom line for the OP, ALL IS GOOD. Not to worry!
Bottom line for the OP, ALL IS GOOD. Not to worry!
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