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FJR Motorcycle Forums
Technical & Mechanical Problems
vibration on front brake just before stopping
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<blockquote data-quote="joebiodiesel" data-source="post: 882627" data-attributes="member: 24445"><p>It may be a low speed ABS Activation. It's a common failure on cars. At low speeds the ABS Sensor signal is not strong enough for the computer to see it. It believes the wheel is locked up and activates the ABS to correct it. Fixing it requires making the signal stronger. Somtimes that can be done by making the air gap smaller. Most often the sensor needs to be replaced.</p><p></p><p>Here is a lab scope measurement of a car that does it. Note the low voltage of the upper signal. As the vehicle slows down, the voltage drops enough that the computer can't measure the frequency of the pulses anymore. That's when the ABS Activates.</p><p></p><p><img src="https://i456.photobucket.com/albums/qq288/joebiodiesel/CGResizes/WSS.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Does it do it every time?</p></blockquote><p></p>
[QUOTE="joebiodiesel, post: 882627, member: 24445"] It may be a low speed ABS Activation. It's a common failure on cars. At low speeds the ABS Sensor signal is not strong enough for the computer to see it. It believes the wheel is locked up and activates the ABS to correct it. Fixing it requires making the signal stronger. Somtimes that can be done by making the air gap smaller. Most often the sensor needs to be replaced. Here is a lab scope measurement of a car that does it. Note the low voltage of the upper signal. As the vehicle slows down, the voltage drops enough that the computer can't measure the frequency of the pulses anymore. That's when the ABS Activates. [IMG]https://i456.photobucket.com/albums/qq288/joebiodiesel/CGResizes/WSS.jpg[/IMG] Does it do it every time? [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
vibration on front brake just before stopping
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