ABS light comes on.Thumping and scouring or mild grinding sound. Pads replace on rear, pads and rotors replaced on front. I was told that the problem is commonly a Failed Wheel sensor.I've pretty much repaired almost everything on all my and my wife's past vehicles. Fords, Chevy's and Chrysler. Is this an expensive fix.
To answer your question, it is a little pricey, if you do it yourself, expect to pay $150.00 - $250.00 for that sensor. The problem is, in my experience, cant find just the sensor, you have to buy the whole stupid hub assembly that has the sensor already in it. But that being said its not hard to replace if you have some vehicle experience.
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Take the tires off and see if the pads are worn out. If they are not worn out, check for rotor warp. When the ABS light comes on the sensors believe a wheel lock has occured and the ABS is reducing the pressure to the caliper pistons.
You'll have to determine which wheel the sound is coming from and check it again. It could be something hitting the rotor or drum other than the shoes and pads. Like a brake spring or guide. You can raise each front wheel one at a time and have someone step on the brakes while you listen too. This may turn on the ABS light however.
Grinding sound ? May be worn brake pads, down to the metal against the rotors. Vibration, could be a warped rotor, wheels not balanced, worn outter tie rods. The ABS light will come on if the tooth ring is broken, giving you a pulsing pedal. That is what the ABS does.
CHECK ABS FUSE AND RELAY.THE AWD CONTROLED BY SPEED SENSORS ONE IN THE FRONT OUT PUT SHAFT SECOND SPEED SENSOR IN THE REAR OUT PUT SHAFT THIRD SPEED SENSOR IS VECHICLE SPEED SENSOR.BEST TO HAVE VECHICLE FIX AT A GARAGE OR DEALERSHIP YOU WILL NEED DIAGNOSTIC EQUIPMENT TO WORK ON IT.
The grinding sound when braking is almost surely worn brake pads. If an abs sensor is bad it will set the abs light on. Heres an easy way to figure whether to look at the front or rear brakes first. When braking, take notice as to whether the vibration is felt more in the steering wheel or the seat. If it is more in the steering wheel take a look at your front brakes first, and obviously if it is felt in the seat look at the back brakes first. Both front and rear need to be checked out because the pulsating you are feeling is due to rotors or drums that have been heated up and warped. In order to fix both problems, you most likely will need brake pads and rotors/drums. If you just replace the pads, not only will the pads wear away faster due to the damage to the rotors/drums, but your vibration issue will not go away and infact may intensify.
It sounds like you have a sticking caliper. Depending on how long it has been since you replaced your brake pads, you may want to get this done. Your pads could be worn completely out and grinding the rotor. If your rotor is severely scored, you will need to have it turned or replaced.
Take the wheel off and check the brake pads, they are probably worn down, and the metal backing on the disc brake pad is rubbing against the rotor.If that is the case, the rotor will need to be replaced, or turned down if it isn't too bad.
I would not ignore this problem. Some damage has been caused to your braking system, i doubt if is is as simple as resetting the abs sensor. You should have the wheels removed and the suspension and braking systems fully checked over either by yourself or a competent mechanic .as the grinding sound could be a symptom of a serious safety hazard.
Driving on a flat could have buckled the rim or damaged the discs, steering or suspension.