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 Chris Your Own Question

Chris
Chris, Car Enthusiast
Category: UK Car
Satisfied Customers: 9807
Experience:  Specialize in UK Chrysler, Dodge, and Jeep vehicles.
12365498
Type Your UK Car Question Here...
Chris is online now
A new question is answered every 9 seconds

Audi A4: I have a 13 yr old Audi A4 1.8 petrol and for some

Resolved Question:

I have a 13 yr old Audi A4 1.8 petrol and for some time now the ABS light comes on at speed and the brake pedal pumps and kicks back a low speed. I have taken it to the garage several times and they say have stripped the entire brakes, wheels etc etc but say the sensors appear fine and there is NO fault showing up on the diagnostics?? The say its either electrical or maybe to replace the ABS pump although there is no fault showing up for this? Can you shed any light on this, the car has done 160,000 miles?. I carry children in my car as part of my job and need to know if there is any danger regarding this? Thanks Paula

Submitted: 1 year ago.
Category: UK Car
Expert:  Chris replied 1 year ago.

Hello and thank you for allowing me to assist you with your problem. Paula, the ABS sensors are probably ok if there are no diagnostic trouble codes in the ABS module. However, there could be a wheel speed that is a little faster or slower than the other wheels. This would make the ABS think that one of the wheels is starting to skid/lock up and go into an ABS mode, and that is why the pedal does what it does at slow speeds. There may be a tone wheel that is damaged, or something as simple as mismatched tire sizes. What the shop needs to be sure of is that all 4 wheels are reporting the same speed at all times to the module. If one or more sensor(s) show a different speed, then closer attention needs to be paid to that wheel in question. One tyre that is worn more than the others could cause this so keep that in mind. In the meantime, the ABS can be disabled by removing the fuse for the ABS module. This will keep the pedal from doing that kick back. It could be a module, but make sure that the garage checks the items I mentioned.

 

I hope this information helps, and let me know if you need further assistance with this.

 

 

Chris

Customer: replied 1 year ago.

Thanks for the advice Chris, I just spoke to the garage and they told me that if one of the wheels were running at a slower speed then it would have been reported during the Bosch diagnostics. The tyres are fine, although I have noticed that the back left tyre loses at least 10 bar within a few weeks and the other tyres lose only 3-5 bar...dont know if this is an issue?


 


Thanks Paula

Expert:  Chris replied 1 year ago.
Well Paula, the low tyre pressure could cause this but once all 4 tyres were properly inflated then the problem would disappear. The botXXXXX XXXXXne is if the garage is certain that it is not a wheel speed sensor issue, then maybe you do have an abs module problem. I just wanted to be sure before you replace that module.

Chris
Customer: replied 1 year ago.

Once the tyres are inflated correctly, the ABS light still comes on and the pedal still kicks back. As long as its not DANGEROUS to continue using the car, I will not replace the ABS pump as the car is so old I dont see the point?


 


Would you say it is safe to continue using the car in this state given that no faults have shown during the diagnostics?


 


Thanks in advance - Paula


 

Expert:  Chris replied 1 year ago.

Ok Paula, then if you are not going to fix it, then what I recommend doing is to have the ABS system disabled by pulling the designated fuse, or disconnect the ABS module connector. Now this may turn the ABS light on, but it will prevent the pedal from kicking back, and the brakes will operate like you do not have ABS. This may be the safer solution.

 

Chris

 

 

Customer: replied 1 year ago.

Hi, thanks again for your advice, I have spoken to Audi and they have said that its highly unlikely to be the ABS pump but mentioned that it may be the CV joint as there are these rings inside it which may be broken and cause the ABS troubles that I am experiencing. I just need to decide what it is that I need to do to sort this car.


 


Best Wishes


Paula

Expert:  Chris replied 1 year ago.

You are welcome Paula. Yes the "tone ring" I mentioned earlier is what the folks at Audi are talking about (in the CV joint). I agree with Audi that it is not the pump.

Good luck, and if you need further assistance, please let me know!

 

 

Cheers,

 

 

Chris

Chris, Car Enthusiast
Category: UK Car
Satisfied Customers: 9807
Experience: Specialize in UK Chrysler, Dodge, and Jeep vehicles.
Chris and 2 other UK Car 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:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Marty

    European Car Expert

    Satisfied Customers:

    349
    ASE & Bosch Certified Master Tech. Over 30 years experience.
< Last | Next >
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    European Car Expert

    Satisfied Customers:

    349
    ASE & Bosch Certified Master Tech. Over 30 years experience.
  • http://ww2.justanswer.com/uploads/IN/indytech/2013-8-8_102717_SantoDomingo146598x6402.64x64.jpg Greg's Avatar

    Greg

    Shop Owner

    Satisfied Customers:

    1040
    17 years Shop Owner /Technician. 27 years experience,
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    UK Car Mechanic

    Satisfied Customers:

    472
    12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Mechanical Engineer

    Satisfied Customers:

    4034
    BEng hons Mech engineering, in auto industry 22 years
  • http://ww2.justanswer.com/uploads/NA/nabilc/2011-1-24_205715_jap500.64x64.jpg Billy's Avatar

    Billy

    Trainer/Master tech.

    Satisfied Customers:

    1276
    Trainer - master tech., SAE member
  • http://ww2.justanswer.com/uploads/witt0018/2009-02-09_180738_trev2.jpg Trevor Witting's Avatar

    Trevor Witting

    UK Car Mechanic

    Satisfied Customers:

    815
    NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician
  • http://ww2.justanswer.com/uploads/RO/RobMechanic/068.64x64.JPG Rob's Avatar

    Rob

    UK Car Mechanic

    Satisfied Customers:

    811
    city and guilds level 1 2and 3. mot tester , 28 years experience set up training college in afghanistan