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      09-02-2019, 06:36 AM   #27
Yogioes
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Drives: BMW 116i 2014
Join Date: Sep 2019
Location: Scotland

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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
Appreciate 0