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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes Rear Brake Pads
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      10-07-2012, 05:03 AM   #1
Scottish John
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Rear Brake Pads

Got warning rear brake pads need replaced. Front show still got 24,000 to go and car has done 25,000 from new with no change. Is it not strange for rear to go way before front based on it being an auto?

Took it to BMW and they checked it (grudgingly) and said yep need replaced. The key fob reader was way out showing 36,000 on front and rear out by a 1,000 and he could not offer an explanation.

Went to kwik fit (UK) and they gave BS story that if they strip it to check it and dont have spares in stock im stuck lol, lazy so and so.

Anyone had similar experience with brake pads and faulty reading from key fob?
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      10-07-2012, 05:16 AM   #2
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Can't comment on Key fob but it is usual for rears to wear much quicker than the fronts. I think it is to do with the traction control breaking the rear wheels and also the brake bias is more to the rear in normal breaking for increased comfort. In emergency breaking it sends more power to the front as they stop the car quicker.
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      10-07-2012, 06:56 AM   #3
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Quote:
Originally Posted by A900ss View Post
Can't comment on Key fob but it is usual for rears to wear much quicker than the fronts. I think it is to do with the traction control breaking the rear wheels and also the brake bias is more to the rear in normal breaking for increased comfort. In emergency breaking it sends more power to the front as they stop the car quicker.
I don't think that's accurate -- the front brakes always do more of the stopping than the rears. The physics are inescapable. Even if you have only 50% of the mass on the front wheels, with the weight transfer forward during braking, you will have more than half of the vehicle's weight on the front tires. That's why the front brakes are larger in diameter with a larger swept area.

My F10 was recently in for service and the car was calling for rear brake replacement soon. The service guy told me there is a problem with the condition-based service calculation on the rear brake pads on the F10s (not sure if it's just 550i or all models) and they reset mine to 10,000 miles.
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      10-07-2012, 08:31 AM   #4
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Perhaps the rear pads wear faster because they are smaller and have less surface area for braking? I haven't looked at the pads, but I have seen this in other vehicles I have owned.
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      10-07-2012, 11:31 AM   #5
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At 2,000km I noticed the wear levels were falling rapidly so took the car in. The front sensor was reset 70,000km and the rear to 50,000km. Within 1,000km, they were down to 30,000km front and 28,000km rear which is roughtly where they were prior to the reset.
In my entire driving life, I have never had rears wear first. Something does seem strange. I also have more brake dust on the rears, the left rear in particular, and very little on the fronts.
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      10-07-2012, 05:15 PM   #6
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As briefly mentioned above, the E-Diff works by utilising itself and DSC, by braking the inside wheel (rear obviously, being RWD!) under power-on cornering to prevent excessive, pointless and embarrassing inside wheel spin!
So, OP, it depends on your driving style! If you like to put your foot down through corners (and which BMW driver doesn't?!) then the E-Diff will do it's job to a greater extent, naturally leading to more wear.
Depending on to what extent, you may or may not see the DSC light flashing on the instrument panel.
DSC does, to a small extent, work in the background without notifying the driver.
Also, traction loss and DSC intervention will increase brake wear, again, depending to what extent and what conditions.
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      10-07-2012, 06:47 PM   #7
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My rear pads wore out first than the front. Dealer said the rear pads are thinner than the front thats why it wore out faster. Maintenance included so i didnt argue. It was replaced.
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      10-08-2012, 04:15 PM   #8
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Thanks to everyone who responded looks like ill cough up the 250 to get them replaced but still does not sit right that they can be so far out and you dont get to see the proof !
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      10-08-2012, 08:42 PM   #9
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You will if you do the work yourself.

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      10-19-2012, 09:29 PM   #10
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Rear Brake Cooloing

Also there is not any active (ducted) cooling for the rear brakes. I have been told thisa is a factor. Any comments?
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      10-20-2012, 01:54 AM   #11
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Time to replace my rear for the 2nd time at 15k miles
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      10-20-2012, 01:54 AM   #12
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Front still has 16k according to the car.
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      10-21-2012, 06:18 AM   #13
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I replaced my E90 320d at 110.000 km with still 20.000 km remaining in front and around 10.000 in rear, both never being replaced before!
Now with my F10 520d it seems I have to replace pads at 50.000 km front and 30.000 km rear. And my driving style has never changed...
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      10-24-2012, 11:29 AM   #14
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I've had a similar issue. Bizarrely my service indicator for a rear brake change decreased to 3000 miles & then started increasing again! Its now down again to 1200 miles. I have no idea what's going on.

Also had some strange behaviour with the indicator for the oil level. Sometimes it tells me that the oil level is too high & shoudl be checked and at other times tells me that the oil level is OK. I've not put any oil in since it was last serviced by my local dealer.

My feeling is that the CBS system is not very reliable!
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      10-24-2012, 12:13 PM   #15
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The rears will go first.
I have 15,000 miles on my car, and I need my rears replaced within 1000 miles (so says my NAV/COM).
I need my brake fluid changed right now though as well as per the NAV/COM.
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      10-25-2012, 08:57 PM   #16
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Quote:
Originally Posted by Fantasm View Post
The rears will go first.
I have 15,000 miles on my car, and I need my rears replaced within 1000 miles (so says my NAV/COM).
I need my brake fluid changed right now though as well as per the NAV/COM.
Write back in 1,000 miles and tell us what happens when a human looks at the actual brake pads.
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      11-13-2012, 03:40 AM   #17
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My car 2011 550X drive shows much less life left on the rear than the front.
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      11-14-2012, 02:29 PM   #18
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Most German mid-sized sedans have rear brake bias where braking for lower speeds is mostly done by the rears and the front brake force is evenly applied during high speed braking. Rear brake bias also allows drivers to have more control by preventing nose dives during high speed braking.
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      11-19-2012, 06:05 PM   #19
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Quote:
My F10 was recently in for service and the car was calling for rear brake replacement soon. The service guy told me there is a problem with the condition-based service calculation on the rear brake pads on the F10s (not sure if it's just 550i or all models) and they reset mine to 10,000 miles.
This was my experience at the dealership also. The rear pads were fine thought the CBS calculation said 1000 km until service required (this at 14k km).
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      11-25-2012, 06:45 PM   #20
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Quote:
Originally Posted by Amleto63 View Post
I replaced my E90 320d at 110.000 km with still 20.000 km remaining in front and around 10.000 in rear, both never being replaced before!
Now with my F10 520d it seems I have to replace pads at 50.000 km front and 30.000 km rear. And my driving style has never changed...
I've got the same feelings... I did 108.000 km (67.000 mls) by E60 523iA without any replacements. Now, according to calculation, to do above 100.000 is possible, but it only refers to the front pads; it seems that rears will not hold more than 50-60.000 km. And the dealer says it would be great result on F10...
It should be noticed, that in addition to the above mentioned reasons (DSC, corners, etc.), some say this situation can be caused also because of Auto-Hold function. In fact, I haven't heard any confirmation of this theory from users of manual transmissions.
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      11-28-2012, 03:20 PM   #21
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Agree!
That's why I use the auto-hold only when needed and always downshift using paddles to help brakes.
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      12-29-2012, 03:56 AM   #22
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Bmw Dealer is informing F10 has got 50:50 braking force for Front & Rear. Additionally, if you use Auto Hold feature; Rear Brakes wears fast.
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