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Anti-lock Brakes

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1.6K views 3 replies 2 participants last post by  qwertz9586  
#1 ·
It snowed last night forming some ice on the wet roads under the snow. This morning, I was on a long straight road with no cars around and I decided to test my ABS. Well, I feel the pedal shake and vibrate violently and hear a grinding noise, but the car started sliding straight as if the wheels locked up! And as I was making a turn while braking (I was going about 15 MPH before braking), the car started sliding towards the outside of the curve and I nearly nailed a curb and fence! Now, I did some research and ABS is suppose to allow me to keep control of the car going straight and turning. I found this interesting tidbt:

Will I notice anything when the ABS is working?

In many vehicles, drivers may experience a rapid pulsation of the brake pedal--almost as if the brakes are pushing back at you. Sometimes the pedal could suddenly drop. Also, the valves in the ABS controller may make a noise that sounds like grinding or buzzing. In some cars you may feel a slight vibration--this means the ABS is working. It is important NOT to take your foot off the brake pedal when you hear noise or feel pulsations, but instead continue to apply firm pressure.
That is exactly what my pedal is doing, but the whole car is sliding as if the wheels are locked up! The pedal drops and vibrates and there's the grinding noise! But my dad says that ABS is suppose to keep the car going straight and if the wheels lose traction, the car's gonna keep going until it stops when momentum runs out. That means if the car loses traction, ABS isn't gonna save me. I was under the impression that ABS will allow me to steer w/o sliding and allow me to stop straight w/o sliding.

Now, the questions. Who is right? And if the ABS is not working, what's wrong?

Oh yeah, I forogot to mention, there's no lights on whatsoever. ABS light comes on normally at start up and goes out and that's about the only time I ever see it. No check engine light either. Fuses are fine. Funny thing is, when I got the car, the ABS light was on, but the dealership fixed it. They said they forgot to put the fuse in after the ABS was worked on.
 
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#3 ·
Originally posted by Racer X@Jan 4 2005, 09:53 PM
Your ABS is working fine. However, you forgot to factor in one thing in your analysis of your ABS system's behavior...

...physics. :)
And good tires, etc.

Depending on conditions, you'll still slide around a little, but not half as much as compared to regular brakes.

For the record though, the theory is that the ABS will keep the wheels from locking, enabling you to be able to turn the car. They're not made to keep the car going straight.
 
#4 ·
My tires are in fairly good condition. I wasn't even going that fast today. I never went above 30 MPH. But once the pedal reached about half way down, it started sliding and grinding and vibrating.