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[LAT] Runaway Prius hits 90 mph before stopping with aid of CHP - Page 32

post #311 of 400
Quote:
Originally Posted by riko99 View Post
I still cant believe it took 8 pages for anyone to figure out about the Emergency Brake... I don't even drive and i know that its there for a god damn reason.
You obviously don't know. It's purpose is to make the car not roll away when its parked. Its not there to stop the vehicle at all.

"Emergency Brake" is really not an accurate name. "Park Brake" would make much more sense.
Edited by ljason8eg - 3/12/10 at 10:32am
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post #312 of 400
Okay, what I don't get is why the brakes apparently don't slow the car down. I'm still a learner driver, and there have been times where I've put my foot down on the accelerator pedal ("gas"), and my instructor has put his foot down on the brake. It's a mechanical link, so when he pushes his brake pedal down, mine also goes down.

But the brake, ALWAYS overrides the accelerator. So even if the accelerator was stuck, why doesn't slamming the brakes slow it down?
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post #313 of 400
Quote:
Originally Posted by [Adz] View Post
Okay, what I don't get is why the brakes apparently don't slow the car down. I'm still a learner driver, and there have been times where I've put my foot down on the accelerator pedal ("gas"), and my instructor has put his foot down on the brake. It's a mechanical link, so when he pushes his brake pedal down, mine also goes down.

But the brake, ALWAYS overrides the accelerator. So even if the accelerator was stuck, why doesn't slamming the brakes slow it down?
In most cars, that is true, the brakes can overpower the acceleration, but in the case of the Prius, the hydraulic brakes are weak. They rely on the regenerative braking system to help slow the car down. Thing is, the regenerative braking won't work if the throttle is wide open.
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post #314 of 400
Quote:
But the brake, ALWAYS overrides the accelerator. So even if the accelerator was stuck, why doesn't slamming the brakes slow it down?
One theory is that the electric motor of the Prius combined with the combustion engine can overpower the stock brakes.

Other theory is that the driver is an idiot and pumps the brakes rather than just slamming them and keeping them there, which causes the brakes to overheat and fail.

Yet another theory is that the idiots slammed the wrong pedal.

Quote:
Article posted by someone:
But when engineers examined these vehicles post-crash, they found nothing that could account for what the drivers had reported. The trouble occurred in cars small and large, cheap and expensive, with and without cruise control or electronic engine controls, and with carburetors, fuel injection and even diesel engines. The only thing they had in common was an automatic transmission. An investigation by the National Highway Transportation Safety Administration found no electro-mechanical defects to explain the problem. Nor did similar government studies in Canada and Japan or any number of private studies.
See, we should be staying with manuals.

With a more serious tone: everyone here should definitely read it. All of it.
post #315 of 400
Quote:
Originally Posted by ljason8eg View Post
You obviously don't know. It's purpose is to make the car not roll away when its parked. Its not there to stop the vehicle at all.

"Emergency Brake" is really not an accurate name. "Park Brake" would make much more sense.
This.

Riko should try accelerating to 60 mph, and release the accelerator.

try pulling the parking brake, see how you'll stop, then come back and post unless you somehow ran off the road and land in the hospital. It does a poor job of braking a non-accelerating car. It would do even worse fighting against a car at WOT.
 
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post #316 of 400
I had a power steering line burst in one of my old cars, drove it for a week and a half while I waited for it to come in. Getting out of a parking lot was a PAIN IN THE BUTT, but driving on the highway I barely noticed the difference, in fact, it honestly made it easier to drive because it slightly muffled my reactions at 70+ speeds.

Shut the dang car off, no power steering at 70 is way better than power steering at 130.
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post #317 of 400
Thread Starter 
Quote:
Originally Posted by ez12a View Post
This.

Riko should try accelerating to 60 mph, and release the accelerator.

try pulling the parking brake, see how you'll stop, then come back and post unless you somehow ran off the road and land in the hospital. It does a poor job of braking a non-accelerating car. It would do even worse fighting against a car at WOT.
I don't think Riko will be going to the hospital...
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post #318 of 400
Quote:
Originally Posted by ljason8eg View Post
In most cars, that is true, the brakes can overpower the acceleration, but in the case of the Prius, the hydraulic brakes are weak. They rely on the regenerative braking system to help slow the car down. Thing is, the regenerative braking won't work if the throttle is wide open.
We have to remember the Prius isn't the only one with the problem, though the way it is designed certainly exacerbates the issue. I think that most vehicle's stock brakes (some sports cars excluded) would overheat before they effectively stopped a car at WOT already going a high speed (say 80mph). It generates a LOT more heat slowing from 80mph to 60mph vs 20mph to 0mph. When you add the WOT factor in, it's as if your car is trying to slow down from a very high rate of speed while going down a road that is sloped steeper than any that already exist. I can see why your typical mommy-car's brakes would fail under the given situation. If I wasn't afraid of warping rotors, I'd try it on mine to see what would happen.

The funny part is, apparently Toyota's sales haven't been hurt at all, according to a news article I read today.
post #319 of 400
Quote:
Originally Posted by SgtSpike View Post
We have to remember the Prius isn't the only one with the problem, though the way it is designed certainly exacerbates the issue. I think that most vehicle's stock brakes (some sports cars excluded) would overheat before they effectively stopped a car at WOT already going a high speed (say 80mph). It generates a LOT more heat slowing from 80mph to 60mph vs 20mph to 0mph. When you add the WOT factor in, it's as if your car is trying to slow down from a very high rate of speed while going down a road that is sloped steeper than any that already exist. I can see why your typical mommy-car's brakes would fail under the given situation. If I wasn't afraid of warping rotors, I'd try it on mine to see what would happen.

The funny part is, apparently Toyota's sales haven't been hurt at all, according to a news article I read today.
You might not have caught the article I posted about this.
http://www.caranddriver.com/features...tion-tech_dept

According to those tests, cars without a ton of horsepower and nose weight seem to do fine even stopping from 100 MPH with WOT.

I do believe their sales have been hurting though. Otherwise you wouldn't be seeing the deals they're currently running.
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post #320 of 400
http://www.msnbc.msn.com/id/35835804/ns/business-autos

The Orange county district attorney has sued Toyota
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