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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
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ABS activating at low speeds, dry pavement
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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.
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 17, 2013, 11:03 AM
Post #2 of 18
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Re: ABS activating at low speeds, dry pavement
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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.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 17, 2013, 11:38 AM
Post #3 of 18
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Re: ABS activating at low speeds, dry pavement
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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.
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dmac0923
Enthusiast
Aug 17, 2013, 11:51 AM
Post #4 of 18
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Re: ABS activating at low speeds, dry pavement
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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?
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
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Aug 17, 2013, 11:56 AM
Post #5 of 18
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Re: ABS activating at low speeds, dry pavement
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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.
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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.
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dmac0923
Enthusiast
Aug 17, 2013, 12:04 PM
Post #6 of 18
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Re: ABS activating at low speeds, dry pavement
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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
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 17, 2013, 12:18 PM
Post #7 of 18
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Re: ABS activating at low speeds, dry pavement
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Do you already know which wheel is causing it?
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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.
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dmac0923
Enthusiast
Sep 3, 2013, 11:44 AM
Post #8 of 18
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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
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 3, 2013, 12:04 PM
Post #9 of 18
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You need frame by frame data from a scan tool to determine which wheel it is.
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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.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 3, 2013, 2:25 PM
Post #10 of 18
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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
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 4, 2013, 1:46 PM
Post #12 of 18
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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.
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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.
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dmac0923
Enthusiast
Dec 5, 2013, 1:58 PM
Post #13 of 18
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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
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 5, 2013, 2:02 PM
Post #14 of 18
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Yes, there is a tone ring mounted to the ring gear. Those rear sensors go all the time.
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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.
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dmac0923
Enthusiast
Dec 5, 2013, 2:05 PM
Post #15 of 18
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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
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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)
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Hammer Time
Ultimate Carjunky
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Dec 5, 2013, 2:09 PM
Post #16 of 18
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No, I've never see that happen. You need to go back to the scanner and see what it's doing now.
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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.
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dmac0923
Enthusiast
Dec 5, 2013, 2:11 PM
Post #17 of 18
(13582 views)
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ok thanks, ill let you know what happens
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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dmac0923
Enthusiast
Dec 21, 2013, 6:27 PM
Post #18 of 18
(13543 views)
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FIXED UPDATE
Turns out it was a bad front left wheel hub assembly.
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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