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F11MSport

Issue with a brakes F11 2012

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Hi,this is my first thread so would like to say hello to everyone and ask for an advice.

Few weeks ago I noticed a difference how brakes in my f11 started working. Brake pedal takes pretty high and is quite hard when pressing (is not soft or flexible as it was before). Also noticed that braking distance is longer than used to be and when I want to completely stop a car,there is a noticeable jerk when car coming to stop. There in no soft stopping.

I changed a brake pads with original bmw parts and skimmed front discs just to take these out of equation.

I am dropping my car next week to the bmw garage to see if they can find anything but would appreciate if someone could put some light on this issue.

Thanks

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5 minutes ago, F11MSport said:

Hi,this is my first thread so would like to say hello to everyone and ask for an advice.

Few weeks ago I noticed a difference how brakes in my f11 started working. Brake pedal takes pretty high and is quite hard when pressing (is not soft or flexible as it was before). Also noticed that braking distance is longer than used to be and when I want to completely stop a car,there is a noticeable jerk when car coming to stop. There in no soft stopping.

I changed a brake pads with original bmw parts and skimmed front discs just to take these out of equation.

I am dropping my car next week to the bmw garage to see if they can find anything but would appreciate if someone could put some light on this issue.

Thanks

 

Welcome,

Did this change of brake feel suddenly occur? What led you to skim the discs and replace the pads, were they worn or warped? Skimming discs these days is not common as the minimum disc thickness is only 2.4mm less than the thickness of a new disc. Has the brake fluid been replaced within the past 2 years by a reputable garage? Is it an auto and is the jerk from the brakes or the gearbox?

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Hi yes,its auto 520d .

I have changed pads and skimmed discs after issue with brakes appeared. 

Brake fluid supposed to be changed 2 months ago when I was buying car from a garage.It shown on the idrive that fluid is due to be changed in September so garage allegedly changed that (whether they actually did or not I will never know) prior car to the car delivery.

On 9/26/2017 at 4:59 PM, Matthew Ashton said:

 

Welcome,

Did this change of brake feel suddenly occur?

I noticed that change next day after long trip. During this trip,at some point I had to brake heavily but cannot imagine how this would affect it so badly. 

Edited by F11MSport

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3 minutes ago, GeeJayJoe said:

It really sounds like the vacuum servo assist is not functioning.

 

If you allow a car to run down a hill with out the engine on, and then brake.... it will feel as you described.

 

 

Sent from my iPhone using Tapatalk

I did that simple servo check when I pumped brake pedal when engine off,started the engine and the pedal dropped a bit. It seems to be brake assistance issue as you said but wonder if local garage will be clued enough to spot the problem.

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I would check the brake reservoir to make sure it all looks good there with no leaks and the fluid should be golden in colour (although that is not at all a scientific check). The brake reservoir is underneath the plastic cover on the left side at the back of the engine bay. It is held on by 3 plastic rivets that you can pull up and out with your fingers. Pull up the bonnet seal in that area and the plastic just comes away. I would also always start by having the error codes read to see if something has been flagged on the system. Carly or ISTA with an ENET cable can read the codes or a reasonable garage. 

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There are no errors currently on the dash,when I dropped the car to the garage where I bought the car,they blagged it that its brake characteristics.Just load of bull@"#it .

Edited by F11MSport
spelling

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18 minutes ago, F11MSport said:

There are no errors currently on the dash,when I dropped the car to the garage where I bought the car,they blagged it that its brake characteristics.Just load of bull@"#it .

 

The errors I refer to are stored in the modules in the car and won't necessarily come up on the dash and can only be read with the methods I mention above.

 

As this is the braking system, we can just speculate but getting it to a specialist asap is your best way forward.

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I would suspect something amiss with the brake servo unit, it needs a poke about to see if there are any leaks or breaks somewhere.

 

But if you think your brakes are compromised, do not pass go, drive straight to a garage for a check over.

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You could check if the brake brake fluid was changed by the garage allegedly or not with a genuine Wurth brake fluid tester, whilst they are not as accurate brake fluid testers that heat the fluid up to check moisture content of the brake fluid, and being German made they are better than all the cheapo testers about and they are accurate enough to prove if the fluid was in fact changed as this was only recently done by your garage when purchased, the brake fluid is tested range  0%, <1%, approx. 2%, approx. 3%, >4% of moisture, as yours has only just been changed I would not expect the moisture content to be above 1% ,if its two or more years since last brake fluid change it will be showing >2% -3% moisture or possibly more.

The brake fluid I use in both our Mini Cooper and the BMW F11 is Pentosin  DOT4 LV (low viscosity brake fluid) which is recommended for Mini all years and BMW from 2002.onwards, as our mini brake fluid was not changed until four years old due to the so called  Mini TLC service pack covered first brake change, I thought that I  noticed when I changed the fluid myself at fours years old the brake pedal was slightly harder ( ie not very slightly soft when mini garage changed the fluid at two years, on our F11 when I changed the brake fluid at two years I did not notice any difference whatsoever, my conclusion maybe the mini did not have low viscosity brake fluid installed when new or subsequent change.

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20 hours ago, Oilburner said:

You could check if the brake brake fluid was changed by the garage allegedly or not with a genuine Wurth brake fluid tester, whilst they are not as accurate brake fluid testers that heat the fluid up to check moisture content of the brake fluid, and being German made they are better than all the cheapo testers about and they are accurate enough to prove if the fluid was in fact changed as this was only recently done by your garage when purchased, the brake fluid is tested range  0%, <1%, approx. 2%, approx. 3%, >4% of moisture, as yours has only just been changed I would not expect the moisture content to be above 1% ,if its two or more years since last brake fluid change it will be showing >2% -3% moisture or possibly more.

The brake fluid I use in both our Mini Cooper and the BMW F11 is Pentosin  DOT4 LV (low viscosity brake fluid) which is recommended for Mini all years and BMW from 2002.onwards, as our mini brake fluid was not changed until four years old due to the so called  Mini TLC service pack covered first brake change, I thought that I  noticed when I changed the fluid myself at fours years old the brake pedal was slightly harder ( ie not very slightly soft when mini garage changed the fluid at two years, on our F11 when I changed the brake fluid at two years I did not notice any difference whatsoever, my conclusion maybe the mini did not have low viscosity brake fluid installed when new or subsequent change.

thanks for your advice

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