When I press the brakes, when I am going slow, it feels like the anti-lock system is coming on. When I push hard on them it does not happen. Is there something wrong with my anti-lock brake system?|||You may have a defective wheel speed sensor. I am assuming the feeling that you are experiencing is a sort of buzz/pulsation. To differentiate this problem from a out of round rotor, take the vehicle to a WIDE OPEN parking lot. Bring it up to 35 mph and slam on the brakes and don't release the pedal. Your ABS should kick in and you should feel the same vibration that you are suspecting at low speed. That vibration is the ABS pump unit now cycling the valve motors in the hydraulic unit. A scan tool can confirm this condition by observing all the speed sensors on the wheels in real time and if a sensor is suspect then an erroneous reading(s) will show up.
Good Luck
A wheel speed sensor that has an open circuit will trigger the ABS lamp. A wheel speed sensor that has a significant difference of reading as opposed to the other sensors will trigger a ABS lamp. A wheel speed sensor that is off slightly will not trigger an ABS lamp but will cause the aforementioned problem. I have replaced them just for this concern. One other fact is if the exciter ring(s) are cracked, it will also cause this concern.|||If there is you better get to a dealer or brake specialist--they are nothing to fool with--my vibration was like yours and it wound up being totally worn out brakes up front--now it is all smooth again--and stops much better. I have a 99 Suburban. You gotta do it so get going---and you need a total job for effective stopping...make sure you don't half step it !!|||if it were a wheel speed sensor or any other electrical problem it should command the abs light on and disable the abs system. if the light is not illuminated it sounds like your rotors are too thin or out of round, good luck|||there may not be enough brake fluid or there may be a bad sensor
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