Question about 1999 GMC Sierra

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ABS PANAL LIGHT & EMERGENCY BREAK PANAL LIGHT ON.

THE ABS & EMERGENCY BREAK LIGHTS ARE ON IN THE PANAL. PLEASE LET ME KNOW WHAT COULD BE CAUSING THESE LIGHTS TO SUDDENLY BE ON.

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Your is mostlikly on because there are 4 sensors on each axle that read wheel speed, when one malfunctions it sends a signal to the ecm to throw that light, the brake light is probably due to the tention of your ebrake, if it engages right when you start pulling it up then the lever does not go high enough to let the plunger out of the sensor attatched to the ebrake lever, or that sensor could have gotten broken or stuck also, i would adjust your pedel down by the lever should see a sensor that can be unscrewed and backed up then retightend back down, or you may have to adjust your break. the abs should be able to be taken to a autopart store and they can hook it up to a codereader for free and let you know which one is malfunctioning or if it is the entire abs unit since there is a computer that goes to them all though the sensors are out to the elements and usually always mess up down the road from heat and watter, hope that answered all your q's, if it did throw me some blue take care gal

Posted on Sep 13, 2008

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Theres only a few things that will make both lights at the same time first you need to rule out a leak in any hydraulic part blown wheel cylinder,rotted brakeline,leaking master cyl ,leaking caliper or hose first check your brake fluid levelhave somone apply the brakes hold pressure on the pedal look for any sighns of wetness or leaks most common problem wheel cylinder breaks pressure in system turning your light on if your shoes are way down or out of adjustment these cylinders hsve to extend way out to touch the shoe to the drum causing the wheel cylinder to blow creating hydraulic pressure drop tripping your lights

Posted on Sep 13, 2008

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