'01 ABS situation
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From: Syracuse
'01 ABS situation
Hey everyone, I know I haven't been around in a while. I see more new names than familiar ones!!
Here's what I have, '01 150 7700 4X4, 4 wheel abs, 4 wheel disc brakes.
Here's what they're doing, when slowing, almost to a stop, the ABS fires, 98% of the time. I've noticed that when this happens, the truck pulls slightly to the left. In a stone driveway, the front left tire made a small skid mark. The tire is doing this while the ABS is firing. My guess is that the right ABS sensor is triggering this, causing the right side to release, while the left side holds. Any input is welcome, and appreciated. Rob
Here's what I have, '01 150 7700 4X4, 4 wheel abs, 4 wheel disc brakes.
Here's what they're doing, when slowing, almost to a stop, the ABS fires, 98% of the time. I've noticed that when this happens, the truck pulls slightly to the left. In a stone driveway, the front left tire made a small skid mark. The tire is doing this while the ABS is firing. My guess is that the right ABS sensor is triggering this, causing the right side to release, while the left side holds. Any input is welcome, and appreciated. Rob
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Joined: Jan 2004
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From: St Louis
Unplug the ABS fuse and make several stops with no ABS system active. See if the vehicle pulls to either side. If so, you have a base hydraulic braking system concern that is manifesting itself only when the ABS fires (which is too touchy). One of the causes for a too-touchy ABS system is a single wheel that is too "grabby". If you can notice this concern without the ABS active, I'd pay close attention to the brake hose (collapsed), the caliper sliders, or the calipers themselves as possible causes.
There is no difference from side to side in the applied hydraulic brake modulation. When any sensor detects a condition that calls for ABS activation, the whole system activates. It is not selective in application to a single wheel.
If the base hydraulic brakes are without a fault concern, then look at the ABS sensor rings on each rotor. They tend to crack or, due to corrosion, to deform and cause an irregular signal to be sensed by the pickup sensor. Have the rotors been replaced by inexpensive replacements, by chance? Some of them have exhibited poor quality related tot he sensor ring installation.
Steve
There is no difference from side to side in the applied hydraulic brake modulation. When any sensor detects a condition that calls for ABS activation, the whole system activates. It is not selective in application to a single wheel.
If the base hydraulic brakes are without a fault concern, then look at the ABS sensor rings on each rotor. They tend to crack or, due to corrosion, to deform and cause an irregular signal to be sensed by the pickup sensor. Have the rotors been replaced by inexpensive replacements, by chance? Some of them have exhibited poor quality related tot he sensor ring installation.
Steve
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From: Syracuse
Well, it's a 4X4, so the sensor is in the hub bearing.
I did unplug a sensor, as you said, and found no problems with pulling, or other wise. It only pulled left when the abs was activated.
When the abs fires, it's monitoring and controling wheel speed, if it senses one wheel "locking up" it briefly releases that wheel to maintain steering control. At least that's how I think it works, in the front anyway.
I have a spare [new] bearing on the shelf in the garage. I may try and swap cords and hope the problem isn't the internal part of the sensor.
I did unplug a sensor, as you said, and found no problems with pulling, or other wise. It only pulled left when the abs was activated.
When the abs fires, it's monitoring and controling wheel speed, if it senses one wheel "locking up" it briefly releases that wheel to maintain steering control. At least that's how I think it works, in the front anyway.
I have a spare [new] bearing on the shelf in the garage. I may try and swap cords and hope the problem isn't the internal part of the sensor.
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Joined: May 2006
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From: Iowa
my abs fire's as well and mine isnt the sensors...i think its the control box for the abs down one the drivers side of the truck... next to the power steering box...im going to try to swap myne out soon.. see if that makes it work properly
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Joined: Aug 2007
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From: New Brunswick Canada
I recenlty replaced my hub bearing as the gentleman above provided the picture, if it is this problem don't just by the sensor and put it in the old hub (It was actualy cheaper to by the hub with the sensor at Ford) as the plastic pieces at the end of the sensor fell out of mine and was in my old hub. good luck , please update us on what was the cause as this helps us rookies trouble shoot those problems if we have them
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From: Syracuse
Will do, I'm goin' on a 3 three hour ride tomorrow, then I'll get after it once I get there. I'll look at both sensor cords, and take an ohm reading on each. If I see something worth showing, I'll take a pic or two.
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Joined: Jul 2005
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Rob, you have individual wheel sensors in the front, but the brakes apply both front at the same time. there is only one hydraulic line that feeds both brakes.... i would think your problem is probably back at the controler as SHO89 said.
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From: Syracuse
Well, I didn't know what I'd find, so I did a little trial and error. For amusement purposes, I swapped the sensor cord with the bearing sitting on a shelf in the garage. Wouldn't you know that cured it. I drove it for a 20 minutes trying to get to act up as it did before, but it didn't. I took it out in the fields and the abs works fine. I think what happened, is the cord must have a broken wire in it. Don't know.
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Joined: Jan 2004
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From: St Louis
Well, I need to correct my earlier statement. The front brake calipers ARE individually controlled by the ABS system, the rears are applied both sides simultaneously. Time to update my info....
Ironically, I (belatedly) checked the the service diagnostic and it specifically says to check the sensor on the side opposite the direction of the pull. Looks like you were spot-on in your original opinion.
Steve
Ironically, I (belatedly) checked the the service diagnostic and it specifically says to check the sensor on the side opposite the direction of the pull. Looks like you were spot-on in your original opinion.
Steve
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