UK Car

UK Car Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

UK Car

My name is ***** ***** I have a 2008 ML350 the brake lights

Customer Question
Hi my name is *****...
Hi my name is ***** ***** I have a 2008 ML350 the brake lights wont turn off once pressure is applied to the brake and released There is no switch in the ML350 so I have been told it could have something to do with the real SAM unit
JA: Thanks. Can you give me any more details about your issue?
Customer: the brake lights wont turn off once pressure is applied to the brake and released
JA: OK got it. Last thing — Mercedes Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.Category: UK Car
Show More
Show Less
Ask Your Own UK Car Question
Answered in 4 hours by:
1/29/2016
UK Auto Mechanic: Peter Zavarelli,
 replied 1 year ago
Peter Zavarelli
Category: UK Car
Satisfied Customers: 30,476
Experience: Technical Consultant at Just Answer
Verified

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

Has anything after market been installed on your vehicle recently that was wired into your vehicle?

Was anything done on the vehicle recently that may have caused this issue here at all?

Let me know so we can continue,thanks Pete.

Ask Your Own UK Car Question
Customer reply replied 1 year ago
Nothing after market has been installed. The car was recently serviced and a full diagnostics was done. I recently replaced an ABS sensor on the car but there are no warning lights on the dash and the vehicle is working as normal.
Customer reply replied 1 year ago
When the car is first started the brake lights are off, only once the brake pedal is pressed then released do the lights NOT go off again and remain on until the car is turned off.
UK Auto Mechanic: Peter Zavarelli,
 replied 1 year ago

O.k.,the brake pedal when pressed activates the brake booster and the brake booster then signals the esp control module which in turn signals the rear sam to turn on the brake lights.There should be a sensor in the brake booster that activates the signal to the esp and so on to the sam unit.This sensor can fail and cause this here.I believe this sensor is the brake booster pressure sensor or brake pressure sensor and is usually located on the front or bottom of the brake booster itself.Usually the brake booster has to be replaced on some models in order to replace this sensor.

Usually if this was the rear sam at fault the issue would occur at all times and in this case it only occurs after the brake is applied so to me from here this sounds like this brake booster sensor is at fault needing replaced.

I would have this checked/tested further to verify this is the cause here.This usually requires a scan tool that can communicate with the brake system or a dealers sds machine to see if this sensor is sending an incorrect signal needing replaced.It is possible the rear sam is at fault but not as likely as the booster/sensor.

https://www.dropbox.com/s/xu6mn1js9q469ag/boos-01-29.gif?dl=0

https://www.dropbox.com/s/2d0yu0p3wut19o1/booster-01-29.gif?dl=0

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Ask Your Own UK Car Question
Customer reply replied 1 year ago
Thanks Pete, I will try your suggestion and see if that is the issue. I will send feedback.
UK Auto Mechanic: Peter Zavarelli,
 replied 1 year ago

Your welcome.Let me know if you need anything else here and feel free to rate my help here as this is how I receive credit for my time.

Thanks Pete

Ask Your Own UK Car Question
Ask Peter Zavarelli Your Own Question
Peter Zavarelli
Peter Zavarelli
Peter Zavarelli
Category: UK Car
Satisfied Customers: 30,476
30,476 Satisfied Customers
Experience: Technical Consultant at Just Answer

Peter Zavarelli is online now

A new question is answered every 9 seconds

How JustAnswer works:

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

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

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!!!!

AlexLos 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.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, 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.

EstherWoodstock, 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.

RobinElkton, 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.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Marty

Marty

European Car Expert

416 satisfied customers

ASE & Bosch Certified Master Tech. Over 30 years experience.

Greg

Greg

Shop Owner

1,323 satisfied customers

17 years Shop Owner /Technician. 27 years experience,

Richard

Richard

UK Car Mechanic

615 satisfied customers

12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified

Matt

Matt

Mechanical Engineer

4,638 satisfied customers

BEng hons Mech engineering, in auto industry 22 years

Trevor

Trevor

UK Car Mechanic

853 satisfied customers

NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician

Rob

Rob

UK Car Mechanic

823 satisfied customers

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

martin jones

martin jones

UK Car Mechanic

640 satisfied customers

25 years as a mechanic and mot tester, owned own business for 10 years city and guilds trained

< Previous | Next >

Related UK Car Questions
Yesterday I lowered the roof on my 2004 bmw 645ci, As I
yesterday I lowered the roof on my 2004 bmw 645ci , As I tried to raise the roof no faults came up and it would not operate , checked all fuses and all ok , raised the roof manually abd locked it in p… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,421 satisfied customers
Had new battery fitted now the alarm keeps going off. WG60
Had new battery fitted now the alarm keeps going off … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,421 satisfied customers
'When I fill the tank the fuel guage on my 02 Volvo V 40
'When I fill the tank the fuel guage on my 02 Volvo V 40 still registers zero. … read more
internal88
internal88
Product Manger
Bachelor's Degree
623 satisfied customers
Does anyone have any information on the fuel system on a
Hi, does anyone have any information on the fuel system on a 2000 Deawoo Musso 2.3 petrol. I require the fuel pump relay location and part number. Cheers… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
I've a Mazda 6 2.2D Skyactive 2013. Having problems with
Hi. I've a Mazda 6 2.2D Skyactive 2013. Having problems with "Vehicle Systems Inspection Required" warning. Intermittent fault which resets when engine turned off. Only DTC is U1900 which may be false… read more
Peter Zavarelli
Peter Zavarelli
30,476 satisfied customers
It is overheating on short slow drives as in 2km as well as
Hi It is overheating on short slow drives as in 2km as well as on the freeway. Fitted a new radiator 2 months ago and car was going fine . Just last two days a problem. … read more
Peter Zavarelli
Peter Zavarelli
30,476 satisfied customers
I have a Nissan Altima 2009 2.5L had a recent oil change.
I have a Nissan Altima 2009 2.5L had a recent oil change. Running good then idle miss ( one month later) , there was previous reduction of MPG about 2 or 3MPG, and got codes P0117, P0118, P011. I rece… read more
HondaPlatinum
HondaPlatinum
High School or GED
148 satisfied customers
My Tata Safari has stopped moving, the Engine is running but
My Tata Safari has stopped moving, the Engine is running but the car will not move. I was driving though France, near Rouen when the engine revs started to fluctuate but when I took my foot off the ac… read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
4,638 satisfied customers
Jeep Grand Cherokee 2009 3.0 CRD. From time to time the
Jeep Grand Cherokee 2009 3.0 CRD. From time to time the transmission dont shift gear. Trying manual shif but no reaction. Still in D. Turn off engine and start again and now it works. … read more
Peter Zavarelli
Peter Zavarelli
30,476 satisfied customers
We accidentally tried to start it without the down. We tried
We accidentally tried to start it without the down … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Azera 2011 jams its movements up and down,back and
azera 2011 jams its movements up and down,back and forth.sometimes it … read more
Peter Zavarelli
Peter Zavarelli
30,476 satisfied customers
I have ford Edge 2017, and only one key fob. I read in the
I have ford Edge 2017, and only one key fob. I read in the manual that to reprogram another key I need 2 working key fobs. How can I reprogram another key without going to the expensive ford dealershi… read more
Expert
Expert
15 satisfied customers
I have a t2014 toyota Corolla and I cant open my car trunk
I have a t2014 toyota Corolla and I cant open my car trunk with the inside lever? … read more
Peter Zavarelli
Peter Zavarelli
30,476 satisfied customers
I have a 2006 focus 1.6 petrol variable inlet and exhaust
Hi I have a 2006 focus 1.6 petrol variable inlet and exhaust cam it has the code P0016 corrolation of cam and crank the cambelt timing is correct and has been checked 3 times there is signal from both… read more
Peter Zavarelli
Peter Zavarelli
30,476 satisfied customers
Changed fuel filter vivaro 2005 and used primer bulb to draw
Changed fuel filter vivaro 2005 and used primer bulb to draw fuel up to mainline but after starting the main line runs dry and no more fuel come into it without priming it again… read more
Eric
Eric
Auto Technician
589 satisfied customers
I have a 2007 330i (E90) and it showing error code CC ID 168
Hi - I have a 2007 330i (E90) and it showing error code CC ID 168 (transmission malfunction). There are no symptoms but the light makes me concerned. … read more
Peter Zavarelli
Peter Zavarelli
30,476 satisfied customers
I can't get the Bluetooth on my 2016 Mini S to connect to my
I can't get the Bluetooth on my 2016 Mini S to connect to my iPhone 7. I have followed all the instructions on the car and in the car manual and nothing works! Help! … read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
A 11/12 year old Nissan Micra which I bought 2nd hand. Never
HI, a 11/12 year old Nissan Micra which I bought 2nd hand. Never had any problems and now suddenly battery is draining within hours. Called out the AA who said problem with battery so paid for a new o… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x