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SportTrac Discussion
Wheels, Tires & Brakes
Troubleshooting ABS problem
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<blockquote data-quote="Kevin Palmer" data-source="post: 887631" data-attributes="member: 54263"><p>The toner rings only has to be off a minimal amount. It all comes down to differences..</p><p></p><p></p><p></p><p>When all things are rolling along (no brakes) then the ABS does not care about the toner rings. Tranny does not care as it uses a separate sensor and wire feed to the ECM/PCM (unlike some of the Early versions where the tranny was always compared to the ABS reading to compare speed readings).</p><p></p><p></p><p></p><p>Sooo, once you press the brakes, the sensors send the signal to the ABS brain and or ECM/PCM on some models. THE brain looks at all four, in some cases three, signals. If they all read the same with something like a 1% difference all is well. But,,, if tow say it is going 30 MPH and one says it is going 25 MPH, it thinks that tire or axle is skidding. Thus,, it pulse the other two brakes.</p><p></p><p></p><p></p><p>So like I said, it is a matter of differences, and when the toner rings are not correct, there will ALWAYS be a difference.</p><p></p><p></p><p></p><p>At least you got it fixed...</p><p></p><p></p><p></p><p>No fun figuring that stuff out is it?</p></blockquote><p></p>
[QUOTE="Kevin Palmer, post: 887631, member: 54263"] The toner rings only has to be off a minimal amount. It all comes down to differences.. When all things are rolling along (no brakes) then the ABS does not care about the toner rings. Tranny does not care as it uses a separate sensor and wire feed to the ECM/PCM (unlike some of the Early versions where the tranny was always compared to the ABS reading to compare speed readings). Sooo, once you press the brakes, the sensors send the signal to the ABS brain and or ECM/PCM on some models. THE brain looks at all four, in some cases three, signals. If they all read the same with something like a 1% difference all is well. But,,, if tow say it is going 30 MPH and one says it is going 25 MPH, it thinks that tire or axle is skidding. Thus,, it pulse the other two brakes. So like I said, it is a matter of differences, and when the toner rings are not correct, there will ALWAYS be a difference. At least you got it fixed... No fun figuring that stuff out is it? [/QUOTE]
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SportTrac Discussion
Wheels, Tires & Brakes
Troubleshooting ABS problem
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