ABS on sharp turn
Thread Starter
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Laughing Gas
Joined: May 2006
Posts: 1,192
Likes: 0
From: Oakville, Ontario
ABS on sharp turn
I have an ABS issue. Coming off the free way ramp my abs will engage when I apply the brake peddle. This only happens turning right. doing the same to the left seems to feel something but not as apparent as to the right.
I have no ABS light on and no code.
Last year I replaced the left front wheel hub. but didn't have any issues until this.
Any suggestion where to look.
I have AE and FORSCAN for my iPhone if any of these could be used, some advice would be appreciated.
One more thing I was getting a feeling on my brake pedal last week as if my front rotors needed to be replaced. So I did. Rotors and pads. still feel the same. could my rear rotors need replacing as well?
Thanks
I have no ABS light on and no code.
Last year I replaced the left front wheel hub. but didn't have any issues until this.
Any suggestion where to look.
I have AE and FORSCAN for my iPhone if any of these could be used, some advice would be appreciated.
One more thing I was getting a feeling on my brake pedal last week as if my front rotors needed to be replaced. So I did. Rotors and pads. still feel the same. could my rear rotors need replacing as well?
Thanks
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
How much slop is there in the right front hub? The fact that rotors and pads did not change the brake pedal says something.
Does the steering wheel pull to one side when you lay hard on the binders?
I guess the only way you will know about the rears is to pull the tires and inspect. When is the last time the rear caliper slide pins have been cleaned and greased?
Does the steering wheel pull to one side when you lay hard on the binders?
I guess the only way you will know about the rears is to pull the tires and inspect. When is the last time the rear caliper slide pins have been cleaned and greased?
Thread Starter
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Laughing Gas
Joined: May 2006
Posts: 1,192
Likes: 0
From: Oakville, Ontario
How much slop is there in the right front hub? The fact that rotors and pads did not change the brake pedal says something.
Does the steering wheel pull to one side when you lay hard on the binders?
I guess the only way you will know about the rears is to pull the tires and inspect. When is the last time the rear caliper slide pins have been cleaned and greased?
Does the steering wheel pull to one side when you lay hard on the binders?
I guess the only way you will know about the rears is to pull the tires and inspect. When is the last time the rear caliper slide pins have been cleaned and greased?
Last time I did the rear brakes would have over a year ago. Maybe thats where I'll start and the check for any right front hub slop.
Thats for a good start.
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
I am not sure what you mean by "How much slop is there in the right front hub". If you asking did I feel any excess play during the brake job? I did not feel any, but then again I was not checking for any.
Last time I did the rear brakes would have over a year ago. Maybe thats where I'll start and the check for any right front hub slop.
Thats for a good start.
Last time I did the rear brakes would have over a year ago. Maybe thats where I'll start and the check for any right front hub slop.
Thats for a good start.
Thread Starter
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Laughing Gas
Joined: May 2006
Posts: 1,192
Likes: 0
From: Oakville, Ontario
I am working Saturday so will give it a look see on Sunday to check for bearing slop.
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Lead Driver
Joined: Dec 2006
Posts: 6,496
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From: So. Jersey
Use Forscan and monitor front left, front right, and rear speed sensors. They all should read the same. If one is reading differently than the rest it will try to correct it by applying ABS.
I think the PIDs are under ABS in the selection of mudules.
I think the PIDs are under ABS in the selection of mudules.
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Thread Starter
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Laughing Gas
Joined: May 2006
Posts: 1,192
Likes: 0
From: Oakville, Ontario
But what about the rear?
What could be causing this?
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Driving in a straight line the rear should match the front. That is adjustable through programming of the PCM. Do you have a code for it being off?
Can you duplicate the problem? If so, put the Forscan readouts in LINE GRAPH display. Have someone drive and you monitor the graphs. Watch for any breaks in the lines when the problem is diplicated. This will help decipher which sensor is giving problems.
Can you duplicate the problem? If so, put the Forscan readouts in LINE GRAPH display. Have someone drive and you monitor the graphs. Watch for any breaks in the lines when the problem is diplicated. This will help decipher which sensor is giving problems.
Thread Starter
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Laughing Gas
Joined: May 2006
Posts: 1,192
Likes: 0
From: Oakville, Ontario
Driving in a straight line the rear should match the front. That is adjustable through programming of the PCM. Do you have a code for it being off?
Can you duplicate the problem? If so, put the Forscan readouts in LINE GRAPH display. Have someone drive and you monitor the graphs. Watch for any breaks in the lines when the problem is diplicated. This will help decipher which sensor is giving problems.
Can you duplicate the problem? If so, put the Forscan readouts in LINE GRAPH display. Have someone drive and you monitor the graphs. Watch for any breaks in the lines when the problem is diplicated. This will help decipher which sensor is giving problems.
looks like the front R/F and L/F speed is higher thern the rear. appx 10% higher.
What could couse this?
Hotshot
Joined: Dec 2014
Posts: 17,824
Likes: 3,104
From: Jersey Shore
It's been ten years since I did this, but from memory if you're looking at pulse count the rear tone ring has a higher tooth count so it's pulse hold he higher. If you're looking at speed, then the ABS already does the calculation to equalize.
In a turn the front wheels have a different radius, so they will be rotating at different speeds and the ABS software has a tolerance for that, to a point. So either one of the tone rings in a front hub is failing, a front hub sensor is failing and not reporting consistently (ABS thinks the tire is sliding), or most likely there is a fault in one of the ABS cables providing inconsistent readings when it's moved in a specific direction.
Unfortunately right now I can't hook up anything my truck to read it's ABS signals to verify the native output is different front hubs to rear differential and refresh my memory. The Ford pickups were just one on many vehicles we had in the fleet. I have be wrong about the count.
In a turn the front wheels have a different radius, so they will be rotating at different speeds and the ABS software has a tolerance for that, to a point. So either one of the tone rings in a front hub is failing, a front hub sensor is failing and not reporting consistently (ABS thinks the tire is sliding), or most likely there is a fault in one of the ABS cables providing inconsistent readings when it's moved in a specific direction.
Unfortunately right now I can't hook up anything my truck to read it's ABS signals to verify the native output is different front hubs to rear differential and refresh my memory. The Ford pickups were just one on many vehicles we had in the fleet. I have be wrong about the count.