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Braking System Fault message - Megane 3 **Fixed**

57K views 13 replies 8 participants last post by  Fraser L  
#1 ·
Hi guys,

Really hoping someone can help.

My Megane iii 2010 wont start and has the message Braking System Fault displayed on the dash. As well as the warning lights ABS, STOP, (!) symbol and the spanner symbol. Also the headlights a stuck on too!

I have checked Brake fluid levels which is ok and i have also checked the ABS fuse which is also fine. I could also hear a high pitched tone coming from the engine bay. I have pressed the brake pedal and that seems fine too.

Hope fully this description explains my issue sufficiently.

Your help would be most appreciated!

Thanks you
James
 
#4 ·
Hi I had a similar problem with the same message but I had no brake pedal, It turned out to be the ABS chip had failed. With your car not starting then you will have brake pressure until the engine is started and the servo kicks in. Try checking the earth straps and the starter motor too, once you get the car started you may get a better picture of what's gone wrong. Hope this helps
 
#7 ·
Me again!

So this morning I couldn't start the car again for about 10 mins. I had another message on the dash but this time saying 'Turn Steering Wheel + Start'. The steering wheel locked so i couldn't start the car.

I have a feeling that the battery is on the blink. Would you think that this is a possible cause?

Thanks again.
James
 
#8 ·
It is a Likely battery fault, this weather soon finds duff batteries. :frown2:
Have you got your wheel under tension? Try wiggling wheel whilst pressing start button. Had this a couple of times.
 
#9 ·
Hi. Thanks for your response.

I was trying that but to no avail.

It did eventually start again after about 10 mins of trying. About 2 mins into my journey to work, the Brake System Faulty message came up again and i lost power steering for about 5 seconds. It did however go back to normal but it was slightly worrying.

I have booked car in afterwork to get battery replaced but i will ask to get it tested before i do this to make sure its not something else!

Thanks again for your help.
 
#11 ·
Hi, you need the test your battery in null and under load and then read voltage values. If the battery OpzS, you need to know battery age. If about 5 Years old, probably it is end of its life.
1. step of testing; it should be 12,4-12,7V. It souldn't be under 12,2V and more than 12,9V.
2. Step; Engine should be not running.
When you try to start engine while you measure voltage value, it shouldn't get under 9,6V at first start. You need a assitant for that test. If you read less than 9,6V, you can suspect about sulphation.
I recommend OPzV type battery for long and stable life.
Security precautions must be taken in these processes!.