I have the disc off and the allen screw that holds the sensor , the reason I am removing sensor is to make sure it is not dirty or rusted. When I go stop, at the very end of the stop under 5k, the abs on the driver side wheel kicks in and the opposite side brake applies harder.I wwas told to clean up that sensor but can't get it off. Help please
Before you get too carried away: You dont say where you live or the year of your truck. GM recognizes the problem with the wheel-speed sensor, particularly in areas of US and Canada where they use lots of salt on the roads. GM offers (to the lucky ones) free repair for that sensor/ABS problem. Check with your dealer.
Often the sensors are destroyed in trying to remove them...but you can try lots of penetrating oil, let soak overnight and then try to gently pry the sensor out. Good luck.
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What happens is a speed sensor at one of the wheels is dropping out at low speed. The abs interprets this as the wheel locking up, even though it is not, and activates to unlock the wheel.
there are a couple of things that can cause this.
1. Excessive play in a front wheel bearing. With the tire off the ground grab it at the 12 and 6 o'clock positions and push/pull. If you feel movement you may have just found the problem.
2. there is a TSB that has you check for excessive rust build up where the sensor enters the wheel bearing. To do this you will need to remove the caliper and the rotor. You should see the sensor bolted to the bearing/hub assembly with usually an allen head bolt. Remove the bolt and carefully remove the sensor. If the sensor brakes off you will have to replace the hub/bearing. With the senor removed clean all the rust where the sensor mounts to the hub. Apply some dielectric grease to the area and reinstall the sensor. Do this for both front wheels.
If none of those resolves this than you will need a high end scan tool capable of reading live ABS data. With the speed sensors displayed drive the vehicle under the conditions necessary to duplicate the symptom. See what wheel drops out and then focus on that wheel.
your abs fault will be the right rear wheel speed sensor, it wont need replacing you just neet to remove the brake caliper and caliper frame, remove brake disc so you can get to the allen key bolt that holds the sensor in. remove the sensor and clean up where it sits and re-fit. as for the speedo fault i think the speedo drive is located on top of the diff. you may want to try removing the clocks, unpluging them and pluging them back in again
Both front wheels look for wire coming out of center.Either screw on to backing plate with allen head screw or are riveted.Look for wires out of rear wheels but you may see there are none. There may be one abs sensor in rear end. It will screw into the top.
hi had rhis on a few 307's what you need to try first is remove the o/s/r wheel, brake caliper and brake disc, and hub, remove the wheel speed sensor by undoing the 5mm allen key bolt and clean where the sensor sits then rebuild and give it a run all being well it should clear the fault. if that doesnt work it will probably need the sensor replacing
You will also need 5" clamp, screw type to compress calipers, be careful to slightly loosen the bleed screw while doing so or ABS system could be adversly affected. Allen wrench should be a 5/16 but the sell just a single wrench to do the job if it a bigger size. You will also need to figure out how to remove the allen head bolt, I use box end wrench on the allen wrench to torque long end down.
Prior to the brakes being replaced you more than likely had metal to metal contact which can throw metal shavings on the ABS wheel sensors. This metal shavings stick to the road grime on the wheel sensors showing the ABS computer a false reading making the ABS light come on. On Ford Windstars, the ABS light and the traction control light are on the same circuit. A simple (and cheap) fix is to pull the ABS wheel sensors and clean them with brake cleaner or throttle body cleaner. Make sure you dry them well and reinstall. On the Windstar there is one bold holding the sensors to the back of the wheels. I recommend you spray some WD40 on the bold and wait about 10 minutes before removing.
If this doesn't fix the ABS light and brakes, you can have the ABS system diagnosed at a shop for about an hour labor. (Usally about $100)
I have fixed many of these type of problems just by cleaning the ABS wheel sensors. Good luck.