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abs not working correctly 97 explorer 4wd #4488660
08/14/17 07:23 PM
08/14/17 07:23 PM
Joined: Mar 2017
Posts: 571
West Ma.
rollinpete Offline OP
rollinpete  Offline OP
Joined: Mar 2017
Posts: 571
West Ma.
Hi Bitogers I have a problem with my abs system, maybe you guys can help me with... with all the fuses in and no light on dash comes on (no codes) go down the road, brakes work as they should, but just before I get to a complete stop the pedal will go to the floor and a groan noise from power booster...I can feel a vibration in the pedal when it does this...Doesn't do it all the time, about 3 out of ten times ...I've replaced the rear speed sensor that mounts on top the differential, I took off the two front speed sensors and cleaned them.. still does the same thing...Im running it now with the abs fuses out, and the brakes work as they should, the only problem is abs light is on now, and it'll probably lock up on ice... not too worried about the ice driving, since the 70's had lots of cars without abs, just that stupid light bugs me, plus I would want it to work as it should...Anyone have any Ideas... Thanks


Pete.
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive184k miles
Last Change;
Penn. Plat. HM. 5w30
Fram xg8a, Fram CA8141

I like my oil (slippery).

Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488669
08/14/17 07:32 PM
08/14/17 07:32 PM
Joined: Dec 2014
Posts: 1,671
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,671
'murica
What is the condition of your brake linings? I had exactly your symptoms in a Ranger that needed rear drums and shoes.

Re: abs not working correctly 97 explorer 4wd [Re: Ethan1] #4488699
08/14/17 08:05 PM
08/14/17 08:05 PM
Joined: Mar 2017
Posts: 571
West Ma.
rollinpete Offline OP
rollinpete  Offline OP
Joined: Mar 2017
Posts: 571
West Ma.
the rotors and pads fairly new about 10k on them, linings? you may have something, do you think the front hoses could be stretched, they all look okay but who knows...still why would they work okay with the fuses out...doubt theres a way to check them shrug


Pete.
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive184k miles
Last Change;
Penn. Plat. HM. 5w30
Fram xg8a, Fram CA8141

I like my oil (slippery).

Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488710
08/14/17 08:16 PM
08/14/17 08:16 PM
Joined: Apr 2008
Posts: 37,232
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,232
Ontario, Canada
My father had the exact same situation on his Expedition. Ended up being a baffed wheel speed sensor. Put a scanner on it and monitor them. Which one is buggered up will be readily apparent when you recreate the issue.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488713
08/14/17 08:20 PM
08/14/17 08:20 PM
Joined: Nov 2006
Posts: 19,956
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,956
MA, Mittelfranken.de
You may have a bad front wheel speed sensor, cleaning it does nothing for it if its not reading correctly. Put a scan tool on it and see what the readings are for L/R. I had a 99 ranger do this on me.


ASE L1, Master. Deutsch Meisterbrief.
Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488769
08/14/17 09:23 PM
08/14/17 09:23 PM
Joined: Dec 2014
Posts: 1,671
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,671
'murica
Does it have drums or discs in the rear?

Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488779
08/14/17 09:42 PM
08/14/17 09:42 PM
Joined: Mar 2017
Posts: 119
northwest pa
justintendo Offline
justintendo  Offline
Joined: Mar 2017
Posts: 119
northwest pa
the above posters are correct..one of the speed sensors are dropping out right before you come to a stop, making the abs module think a wheel is locking up.


2013 escape 2.0 awd
2008 fusion 2.3 mtx
1996 f150 4.9 2wd mtx
1999 kaw zrx 1100
many husqvarnas
Re: abs not working correctly 97 explorer 4wd [Re: Ethan1] #4488828
08/14/17 11:15 PM
08/14/17 11:15 PM
Joined: Jun 2005
Posts: 11,344
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,344
Santa Barbara, CA
Originally Posted By: Ethan1
Does it have drums or discs in the rear?


I am 99% sure those were all rear disc, the only shoes were for parking brakes.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488848
08/14/17 11:38 PM
08/14/17 11:38 PM
Joined: Mar 2017
Posts: 571
West Ma.
rollinpete Offline OP
rollinpete  Offline OP
Joined: Mar 2017
Posts: 571
West Ma.
Your right ,It does have rear disc brakes, shoes for parking...you guys are probably right one of the front sensors is probably messed up but witch one...the bearings are still okay no noise or movement, I dont want to throw parts at it $ , I dont have a scan tool for abs, just have a cheap code reader...whats a good and cheap scan tool that would do the job...Seems like the older I get the more I need speciallty tools and the less i'll use them afterwards... ???


Pete.
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive184k miles
Last Change;
Penn. Plat. HM. 5w30
Fram xg8a, Fram CA8141

I like my oil (slippery).

Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488874
08/15/17 12:26 AM
08/15/17 12:26 AM
Joined: Sep 2004
Posts: 2,427
snowblind in TX
punisher Offline
punisher  Offline
Joined: Sep 2004
Posts: 2,427
snowblind in TX
Disconnect the wheel sensor connector. DVOM across the sensor's pins. Ohm sensor...record it.
Set DVOM to voltage....spin wheel...record voltage. Lowest voltage of the two....not good.
Set DVOM to Hz......spin wheel...record Hz. Look for drop outs or fluctuation.

Having a scan tool with ABS PIDS is great. You can see what the ABS module sees, but you have to make due with what you got. Don't know why there is no code.

Since you have a hard fault, I wouldn't waste time checking the tone rings.....unless you actually have a damaged sensor. On second thought, check your tone rings. If they are cast, check for tiny cracks at the base of the teeth, stamped-check for a bent section. Nothing worse than throwing on a new sensor, and then finding out in addition to a bad sensor the tone ring is cracked/bent.

Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488875
08/15/17 12:28 AM
08/15/17 12:28 AM
Joined: Oct 2012
Posts: 2,464
Staten Island, NY
michaelluscher Offline
michaelluscher  Offline
Joined: Oct 2012
Posts: 2,464
Staten Island, NY
Originally Posted By: rollinpete
Your right ,It does have rear disc brakes, shoes for parking...you guys are probably right one of the front sensors is probably messed up but witch one...the bearings are still okay no noise or movement, I dont want to throw parts at it $ , I dont have a scan tool for abs, just have a cheap code reader...whats a good and cheap scan tool that would do the job...Seems like the older I get the more I need speciallty tools and the less i'll use them afterwards... ???


Are you familiar with FORScan?

http://forscan.org/home.html

Have a second person drive while you watch a data list of all ABS pids

You should see your problem, if it's ABS related


'06 Toyota Camry SE V6 3MZ-FE 100k
'01 Mercury Villager Estate VG33E 52k
'06 Ford Taurus SE Vulcan 60k
'13 Chrysler 300 3.6 Pentastar 230k
Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488876
08/15/17 12:29 AM
08/15/17 12:29 AM
Joined: Sep 2002
Posts: 4,099
Lakeville, MN
MNgopher Offline
MNgopher  Offline
Joined: Sep 2002
Posts: 4,099
Lakeville, MN
Had the same symptoms on an '03 F150 - and it was a bad front wheel speed sensor. You will need a scanner that can tell you which channel is flakey. It won't set an ABS code.

And my '97 Explorer was rear discs with parking brake drum setup.

Re: abs not working correctly 97 explorer 4wd [Re: rollinpete] #4488892
08/15/17 01:27 AM
08/15/17 01:27 AM
Joined: Sep 2006
Posts: 1,322
Wisconsin
Black_Thunder Offline
Black_Thunder  Offline
Joined: Sep 2006
Posts: 1,322
Wisconsin
the front wheel bearings are probably on their way out. its bearing/hub unit with the sensor included.

my 98 was doing the same thing but AWD i took the hubs off and you could barely turn the bearings by hand.

turns out once the bearings start to go the metal shavings go into the grease causing the sensor not to read the tone wheel very well and thats why the abs does screwy things without hitting the brake hard or locking up the wheels it would kick on.


I'd buy Callahan autoparts if I could.

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