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Re: brakes binding and abs problem
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 23 Mar 2004 09:46:03 Share Post by Email
In Reply to: brakes binding and abs problem, chris, Mon, 22 Mar 2004 13:38:58
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As to the sticking-
When you press the brake pedal, it presses the pads up against the rotor, stopping things. When you take your foot off the pedal, the pads don't spring back by themselves. As the wheel turns, slight imperfections in the rotor push back on the pads, slightly pushing the piston back. So if you've jacked up the wheel and are spinning it, it would be quite reasonable for the pads to drag for a while. In fact, I expect you'd always get just a little scraping.
Just a hub is pretty hard to turn - first, you've got basically no mechanical advantage - the tire diameter gives you some leverage. Second, I don't know what transmission you have, but since it's the front wheels you're turning, you've also got resistance inside the tranny.

Basically, it doesn't sound like your brakes are binding. If you can turn the wheel by turning the tire by hand, the brakes aren't binding. If both wheels were up off the ground, and you got one of them spinning, it would be reasonable for them to spin down in a rotation or three. With one wheel on the ground, you've got even more differential movement to overcome.

With the system at full pressure, there would be a little more residual pressure behind the piston, so it wouldn't push back quite as much, quite as fast.

As to getting hot - If you drive along and then bring the car to a stop, it's quite normal for the rotors to get hot enough to burn. You've just dissapated as heat the kinetic energy of a 3000+ car moving at 40 mph. Stuck calipers show up as brake pulling, the smell of buring pads, and front end vibration as the heat warps the rotors.

If you really want to check, try this - drive along for a bit someplace you can without using your brakes. Maybe a nice, lighly traveled road for a couple of miles. Then pull the car to the side of the road, using the brakes. Now, touch the metal of the WHEEL (not the rotors)! It's normal for the rotors to be hot. But if the brakes were dragging all that time, they'd be throwing off heat, and that heat would be transferred to the metal of the wheel, and it would be very hot. If one wheel is noticably hotter than the other, and you've got roasted pad smell, then think sticking caliper.

As to ABS light coming on - it sounds like an ABS sensor on the way out. There is continuous self-test running on the sensors, and if one is on the hairy edge of being out-of-spec, under some condtions (temperature, phase of the moon) it goes just enough over the threshold to trip the light. And if the sensor signal is weak, it could give the wrong answer to the ABS, causing the slippage signal.



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