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ABS activating at low speeds, dry pavement


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dmac0923
Enthusiast

Aug 17, 2013, 10:39 AM

Post #1 of 18 (9416 views)
ABS activating at low speeds, dry pavement Sign In

2002 Ford Ranger XLT 4.0 Auto 4wd 179,xxx miles

this problem has been getting progressively worse and has me stumped I have to admit.

When I am coming to a full stop such as at a STOP sign or pulling into parking spaces, the ABS activates. It is usually in the last few feet of the stop and less than 5 MPH.

The ABS light is not on in the dash. It is working however because I can see the light cycle through its test when ignition is turned on.

I have no bearing noise and cant get any play from the hub assembly.
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Aug 17, 2013, 11:03 AM

Post #2 of 18 (9406 views)
Re: ABS activating at low speeds, dry pavement Sign In

Look at the front wheel speed sensors. Check for rust jacking. If the sensor is being jacked up from rust underneath it will cause your problem. Clean the rust off the bottom of the sensor where it seats on the hub bearing and the surface of the hub bearing.







Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
Ultimate Carjunky / Moderator
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Aug 17, 2013, 11:38 AM

Post #3 of 18 (9398 views)
Re: ABS activating at low speeds, dry pavement Sign In

Make sure there is no slop in the wheel bearing either.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dmac0923
Enthusiast

Aug 17, 2013, 11:51 AM

Post #4 of 18 (9395 views)
Re: ABS activating at low speeds, dry pavement Sign In

Hammertime,

i tried with the truck in the air grabbing the wheel at the 3 & 9 oclock position and also the 12 & 6 to see if i could get any movement but was none. I also tried with the wheel and brake components off the hub but got no movement and the hub rolled smoothly. Is there any other way to verify the bearing?
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 17, 2013, 11:56 AM

Post #5 of 18 (9394 views)
Re: ABS activating at low speeds, dry pavement Sign In

What's actually happening is one of the sensors is reading inaccurately at low speeds and activating the ABS because the ABS sees it as a brake locking up. It may be rust or exciter ring damage as DS suggests or it may be a bad sensor. If you have a good scan tool you should be able to look at frame by frame speed data to see the bad one.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dmac0923
Enthusiast

Aug 17, 2013, 12:04 PM

Post #6 of 18 (9392 views)
Re: ABS activating at low speeds, dry pavement Sign In

ok cool i follow you now. and actually im jumping back and forth between the garage and here and ill end up having to put a new sensor in because when i tried to wiggle the original one out of the bore in the hub, the sensor seperated from itself
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


Hammer Time
Ultimate Carjunky / Moderator
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Aug 17, 2013, 12:18 PM

Post #7 of 18 (9391 views)
Re: ABS activating at low speeds, dry pavement Sign In

Do you already know which wheel is causing it?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dmac0923
Enthusiast

Sep 3, 2013, 11:44 AM

Post #8 of 18 (9348 views)
UPDATE Sign In

hey guys, sorry it took so long but i finally finished up installing the two new front abs wheel sensors. I cleaned the mating surface to make sure there was no rust jacking while it was out.

long story short, the abs pulsing has gotten alot better but has not fully gone away. Before it happened all the time at slow roll stops. Now it only does it when the steering wheel is turned to the left.

i hate to throw parts at the problem, but it is hard to focus in on the problem because i am not getting any fault codes.

Any ideas guys?
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


Hammer Time
Ultimate Carjunky / Moderator
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Sep 3, 2013, 12:04 PM

Post #9 of 18 (9342 views)
Re: UPDATE Sign In

You need frame by frame data from a scan tool to determine which wheel it is.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Sep 3, 2013, 2:25 PM

Post #10 of 18 (9337 views)
Re: UPDATE Sign In

Danny: You have all our attention and can't help much myself. I'm stuck on just wires being too short or chafed or something.

Thank you guy. You are and were a building block of this site not forgotten!

Tom



dmac0923
Enthusiast

Dec 4, 2013, 1:40 PM

Post #11 of 18 (9240 views)
Re: UPDATE Sign In


In Reply To
You need frame by frame data from a scan tool to determine which wheel it is.


Ok believe it or not I finally got around to having the truck scanned at my local shop. They search for any fault codes but none were stored. The mechanic then rode around with me while live scanning the wheels.

He said the rear sensor is dropping to 0 just prior to the ABS activating. So he recommended changing the rear sensor.
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 4, 2013, 1:46 PM

Post #12 of 18 (9238 views)
Re: UPDATE Sign In

He may be right. Just make sure it's not a problem with the sensor wiring or the reluctor wheel it reads from. Probably going to end up being a sensor.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dmac0923
Enthusiast

Dec 5, 2013, 1:58 PM

Post #13 of 18 (9218 views)
Re: UPDATE Sign In

well it wasnt the rear sensor. so as of now i still dont have any ABS fault codes and i have new sensors on both front and on the rear end. Im guessing now that it must be a broken tone ring on the front bearings. I think im going to take a guess and tackle the front left bearing since the truck has a substantial pull to the right when braking. Its just frustrating because there is no codes and the live scan tool cant find it either.

The odd thing was the mechanic said the rear sensor was dropping to 0 just prior to the abs symptoms. Im assuming the rear sensor just feeds off the ring gear in the differential?

until i get this sorted out i think im going to just pull the fuse for the ABS and run standard brakes for now
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 5, 2013, 2:02 PM

Post #14 of 18 (9216 views)
Re: UPDATE Sign In

Yes, there is a tone ring mounted to the ring gear. Those rear sensors go all the time.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dmac0923
Enthusiast

Dec 5, 2013, 2:05 PM

Post #15 of 18 (9214 views)
Re: UPDATE Sign In

So hammer, you think the tone ring on the ring gear is F**D up? that doesnt sound like it would be fun to replace. Might be easier just swapping in a used rear lol
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


(This post was edited by dmac0923 on Dec 5, 2013, 2:06 PM)


Hammer Time
Ultimate Carjunky / Moderator
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Dec 5, 2013, 2:09 PM

Post #16 of 18 (9211 views)
Re: UPDATE Sign In

No, I've never see that happen. You need to go back to the scanner and see what it's doing now.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dmac0923
Enthusiast

Dec 5, 2013, 2:11 PM

Post #17 of 18 (9209 views)
Re: UPDATE Sign In

ok thanks, ill let you know what happens
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


dmac0923
Enthusiast

Dec 21, 2013, 6:27 PM

Post #18 of 18 (9170 views)
Fixed it update Sign In

FIXED UPDATE

Turns out it was a bad front left wheel hub assembly.
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1






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