BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > M135i 2013 - Brakes coming on every 30 secs in WET!
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      05-24-2019, 11:20 AM   #23
Morten dk
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You need to code it With Ista. And under retrofit there is a brake wet code there is 3 options but it only displase 2 because your car has 1 coded allready.
Then you thoose brake wet low. And code the car.
Ista.retrofit.brake wet. Low

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      05-24-2019, 12:50 PM   #24
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Smile A sympathetic person detected.

Quote:
Originally Posted by Quent68 View Post
I am happy to hear about people with the exact same problem as me !
Wow. It's so nice of you. I'd say "welcome (enjoy)!" but I'm not one of those suffering from this. Neither sorry about that.
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      05-24-2019, 06:58 PM   #25
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Great
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      05-27-2019, 03:00 AM   #26
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Many thanks for your answers =) Unfortunately, I will have to cancel the sell and return the car to its former owner. I just bought it in April and there are to many other mechanical problems... :'(
So finally I will look for another F20 without any problem (Hope so ! ^^ )
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      09-02-2019, 06:36 AM   #27
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Hi, I'm looking for a solution to the brake drying problem.
Daughter bought a 2014 116i at 3 years old from BMW dealer.
In January, at 4 years old, it had a service by the dealer. Currently on approx 50k miles.
At about 4 1/2 years it started applying the brakes during reasonably heavy rain.
It had not done this before and, being in Scotland, we get a lot of rain!
I'm a DIY'er so I had a look at the car. Cleaned around the rear ABS sensors and took the caliper off. before pushing the piston back, I removed the cover over the reservoir to slacken the cap only to find that it was not fitted. It had been left at the side of the reservoir.
I sooked out as much fluid from the reservoir as possible and topped it up with new fluid.
I took it to the dealer.
Service manager has not heard of the car braking itself when raining problem.
Service manager stated that at last service they would not have looked under the cover as it was not part of that service (although the multi tick sheet states that they checked the fluid....)
They took the car in and measured the fluid water content as <1% which is apparently OK and not surprising as I had replaced it. I should have left it.
They changed the fluid free of charge but could find no fault.
The Service manager asked me several times if the car had been anywhere else. I don't think he believed me.

The problem is still there.

I took the car to and BMW independent specialist.
He has not heard of the car self braking when wet problem.
He said the Rain sensor was set to normal and it was showing no faults.
He downloaded the latest software to the car and reset it to normal.
£200.
He had no other suggestions.

The problem is still there.

Recoding the car to low on the sensitivity is not the answer. The car was fine before so something must be wrong.
I am considering doing another brake fluid flush.
My only concern is ensuring that the fluid in the ABS unit gets changed as I have read that the unit may need to be electrically cycled to change the fluid in there.

It's easy to see why the 3 three year PCP deals have become so popular when faced with these problems.

Is it possible to switch off the brake drying feature? I have managed 500k miles without it so far.

Hopefully somebody has a solution.
Many thanks
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      09-02-2019, 09:50 AM   #28
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Not sure if it's worth to repeat it, but my guess is the brake system could happen to become more clingy than expected. Adding water into the brake fluid could be a solution (just a joke!). Are the pads OEM? Just a wild guess.
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      09-02-2019, 09:57 AM   #29
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The pads should be OEM. The car was bought from BMW dealer with full dealer history and has only been back to them for one service.
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      09-02-2019, 10:16 AM   #30
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Quote:
Originally Posted by Yogioes View Post
The pads should be OEM. The car was bought from BMW dealer with full dealer history and has only been back to them for one service.
So it should be documented the pads have been replaced by the dealer (recently enough to believe they stand). "Never" or "long ago" can imply a non-official service (like DIY ).
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      09-02-2019, 02:55 PM   #31
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Sorry, I don't understand your message?
The pads were not mentioned in the dealer service back in January so I assume they were fitted by the dealer at a service prior to our ownership.
I can't imagine many people take a less than 3 year old car to somewhere other than the dealer for servicing. I know it does happen though.
Definitely not had anything in the last 18 months other than the dealer 4 year service.

Why would non BMW pads affect the working of the brake drying?
I can't think of any reason particularly as this problem only started about a month ago.
The reservoir cap was off for either 5 months or possibly back to Aug 17 when the dealer last recorded a fluid change.
I think this is connected with the fault but it could be a red herring.

I would have thought that BMW would have their own "forum" for mechanics to record problems and solutions.
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      09-02-2019, 10:17 PM   #32
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Quote:
Originally Posted by Yogioes View Post
Sorry, I don't understand your message?
Some people find official service prices too high and the quality doubtful. Some just like to do themselves what they can. Never mind. It's all right if you believe the pads are fine.

The issue seems to be about the car breaking harder than it's supposed to. An easy guess is brake pads can be the reason due to friction quality they provide (different pads can perform differently). I don't really know about non-OEM pads. I just recall some consider them for different reasons.
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      09-03-2019, 01:26 AM   #33
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Thank you for clarifying.

Yes, the car has started braking harder than itís supposed to when driving in medium to heavy rain.
It does this for about 3 to 5 seconds while driving along without the driver touching the brake pedal.
I assume the driver is not supposed to be aware that it is happening and up until about a month ago we were unaware this feature even existed.
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      09-07-2019, 02:57 AM   #34
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Code the car as i explanet in the thread and the problem is Solved.
I work om these cars every Day i know what in takling about.

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      09-07-2019, 11:50 AM   #35
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Ok, but Iím curious, why would we need to change the code to low when it was previously working okay?
Iím wondering what has changed that makes the the car need the setting changed?

Thank you for taking the time to reply.
Iíll get it back to the independent specialist and ask him to set it to low.

Last edited by Yogioes; 09-07-2019 at 11:54 AM.. Reason: Adding more text
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      09-07-2019, 01:43 PM   #36
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Maybe the setting could have changed during a service software update.
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      09-07-2019, 05:14 PM   #37
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The problem started about 6 months after the last service which was in January.
Itís currently set to normal (I think thatís what the technician told me)
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      09-08-2019, 03:52 AM   #38
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I dont know why the brake in wet changes it is software relateret. But its Like When er have bluetooth problems.
Sometimes software just changes the Way it used too work.
Mine did it too after six months. Before there was no problems.

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