How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ironmike Your Own Question

Ironmike
Ironmike, Ford Technician
Category: Ford
Satisfied Customers: 3307
Experience:  30 years ASE Master tech L1 . Ford master
11302663
Type Your Ford Question Here...
Ironmike is online now
A new question is answered every 9 seconds

Ford Crown Victoria Police ABS brake problem with 1997 Ford

Resolved Question:

ABS brake problem with 1997 Ford Crown Victoria, VIN 2FALP71W8VX18XXXX, with 184,000 miles on it.

The outer rear wheel bearings have no inner races; they ride on a case hardened surface on the axle shafts. This case hardened surface failed on the left axle, and the axle wore about a sixteenth of an inch deep all around. Examination of the right axle revealed no wear, but it did have some cracks in the surface. The axle housing was cleaned of metal particles, and both rear axles, outer rear wheel bearings, and seals were replaced. The ABS exciter rings are integral with the axle shafts, so they are new as well. The rear rotors, calipers, parking brake shoes, and all brake hardware were replaced at the same time, and the brake system flushed out with new fluid. It is possible that some air may have been introduced into the brake system at the master cylinder at that time.

When the car was driven (after having sat for about nine months before this work was done), the ABS brake system operated right at the end of almost every stop. (It felt and sounded like you were driving over a washboard.) The ABS light does not illuminate when this happens or at any other time (except for the short time when the system performs its check at each start-up). There was no problem with the ABS brake system before the axle failure. It had previously activated only on snowy or slick roads when appropriate.

Suspecting that the left rear wheel speed sensor may have been damaged by contact with the exciter ring on the worn axle shaft, it was replaced with a used one from another '97 Crown Vic. The condition definitely improved, but the ABS system still activated inappropriately occasionally (maybe once every twenty or so stops). A new wheel speed sensor was put on the left rear, and the condition is now as bad as it was right after the car was first placed back in service.

Other work done at the same time the axle shafts were replaced:

All four shock absorbers were replaced. (The rear ones were fun!)
All tie rod ends and the idler arm were replaced.
Transmission and torque converted were drained.
Transmission fluid and filter were replaced.
Transmission shifter cable was replaced.
Engine oil and filter were changed.

The check engine light is not illuminated, and no engine codes are stored. I do not have the ability to check for any stored ABS brake codes.
Submitted: 3 years ago.
Category: Ford
Expert:  Ironmike replied 3 years ago.

greetings,

I would check the connectors for the sensors especially the front. There is a bulletin for bad connections causing a false abs conditions. You might try to disconnect them one by one and pinch the pins(to make them fit tight) and add dielectric grease)

Since you do not have a scanner to watch the wheel signals from the sensors this might be the best try. You could even ohm the connectors, back probe them and see if there is high resistance(you will need to disconnect the ebcm to isloate the circuit)

let me know what you find

Customer: replied 3 years ago.
Does "ecbm" (in your answer) stand for electronic brake control module? Where is that located? Is it on the ABS controller? Which pins go to which wheel sensors? What should the resistance be for the sensors? Should the resistance be the same for each one? (I do have a digital ohmmeter.) I'm assuming that since changing out the left rear sensor makes the situation change that the problem is located there. If I can definitely pinpoint the problem to one or more sensor connections, I'll clip the durn connectors off and solder the wires.
Expert:  Ironmike replied 3 years ago.
they do not give a spec but I would say more than 5 ohms is too much. The ebcm is the abs module. I will get the schematics in a sec
Expert:  Ironmike replied 3 years ago.

graphic

Anti-Lock Brake Module is located at the LH front of the vehicle, on front of the upper radiator support.

Customer: replied 3 years ago.
I just probed the two used rear brake sensors with my digital multimeter. They're the ones I have off the cars. (I have two '97 Crown Vics--just alike.) One was 1103 ohms; the other was 1097 ohms--essentially identical. That doesn't necessarily mean that either one is good or bad, or that the connectors are making good contact, but the resistance is the same for each of them.

Do you know of a reasonably priced brake scanner? I don't mind spending two or three hundred bucks for one, but I can't justify $2500 or up for a Snap-On or equivalent.
Expert:  Ironmike replied 3 years ago.
I meant ohm the connector(back probed), not the sensor. Scanners that show abs data are not cheap. I will see if I can find an ohm spec for the sensors. We usually just make sure the circuits are good and watch the sensors on a scanner.
Customer: replied 3 years ago.
OK. That helps. Thanks, Ironmike.

I have some more problems to sort out with this car. Like the cruise control doesn't work, but that's for another day. How do I ask for you in the future?

Bob
Expert:  Ironmike replied 3 years ago.
I am not sure what that side of the site looks like. You can keep this question open as long as we keep communicating within 24 hours. There should be a request choice on the question .
Expert:  Ironmike replied 3 years ago.
abs sensors should have resistance between 800 and 1400 ohms
Ironmike, Ford Technician
Category: Ford
Satisfied Customers: 3307
Experience: 30 years ASE Master tech L1 . Ford master
Ironmike and 8 other Ford Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
< Last | Next >
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
  • Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me. Molly USA
  • I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service. Jason V. Kirkland, WA
  • I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there. BR New Jersey
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    Ford Technician

    Satisfied Customers:

    22382
    16 years experience with Ford.
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Ford Technician

    Satisfied Customers:

    5493
    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar

    Chuck

    ASE Certified Technician

    Satisfied Customers:

    1684
    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    1518
    12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.
  • http://ww2.justanswer.com/uploads/BA/baddad1/2014-4-1_23659_avatar.64x64.jpg Mike V.'s Avatar

    Mike V.

    Auto Service Technician

    Satisfied Customers:

    789
    25 years experience on all makes and models, Licensed NYS Inspector.
  • http://ww2.justanswer.com/uploads/lostrider/2009-9-26_23144_php4VNWAA_c1PM1.jpg lostrider's Avatar

    lostrider

    Ford Technician

    Satisfied Customers:

    2940
    ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.
 
 
 

Related Ford Questions

Chat Now With A Ford Mechanic
Ironmike
Ironmike
Ford Mechanic
3307 Satisfied Customers
30 years ASE Master tech L1 . Ford master