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X3 E83 (2004 - 2010)
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  #1  
Old 10-21-2010, 11:48 AM
kenza kenza is offline
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Brake rotor and pad minimal thickness

Hey guys, does anyone know what is the minimal brake pad and rotor thickness (when they need to be replaced)? Thanks!
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  #2  
Old 10-21-2010, 03:59 PM
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Hi Kenza,How's the Xenon project going ?
As far as the brakes;the min rotor thickness is marked on the rotor and the pads (according to the dealer) should be replaced at 3mm
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  #3  
Old 10-21-2010, 11:52 PM
kenza kenza is offline
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Hey X3-po, how have you been?

Xenon is waiting for a weekend with some free time (new 20 days old baby at home is the reason why I am still trying to have some sleep in free time, instead of replacing headlights , but I got all the hardware, including the leveling sensors).

Thanks for the rotor and pad info, will have to visually inspect the brakes
soon.
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  #4  
Old 10-22-2010, 10:10 AM
enamoured enamoured is offline
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Hey Congrats on the new baby
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  #5  
Old 10-23-2010, 12:26 AM
kenza kenza is offline
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Thanks Enamoured!
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  #6  
Old 10-23-2010, 06:49 AM
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X3-terrestrial X3-terrestrial is offline
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Quote:
Originally Posted by kenza View Post
Hey X3-po, how have you been?

Xenon is waiting for a weekend with some free time (new 20 days old baby at home is the reason why I am still trying to have some sleep in free time, instead of replacing headlights , but I got all the hardware, including the leveling sensors).

Thanks for the rotor and pad info, will have to visually inspect the brakes
soon.
Congrats on the baby too! IIRC rotors min thickness is 19mm, but don't quote me, it's engraved on them. 2-3mm is about right for pads, or when the sensor goes off
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  #7  
Old 10-23-2010, 11:25 AM
Supercourse Supercourse is offline
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The numbers I have seen are:

FRONT ROTOR

Normal: 25.0, Min.: 23.4 mm


REAR ROTOR

Normal: 21.9, Min.: 20.5 mm


(I presume "Normal" means the new thickness.
And all model years use the same rotors?
The rear rotors are smaller and thus thinner than the fronts.)
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  #8  
Old 10-23-2010, 06:30 PM
kenza kenza is offline
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Thanks x3-t thanks for the numbers too.
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  #9  
Old 10-25-2010, 07:49 AM
kenza kenza is offline
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I have visually checked the pads and it seems I will have to replace the front pads soon (they are at 3-4 mm at the moment). I will see if rotors are due for replacement too when I take off the wheels.

What about bedding the brakes? Are there any specific instructions?
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  #10  
Old 10-25-2010, 06:11 PM
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Quote:
Originally Posted by kenza View Post
I have visually checked the pads and it seems I will have to replace the front pads soon (they are at 3-4 mm at the moment). I will see if rotors are due for replacement too when I take off the wheels.

What about bedding the brakes? Are there any specific instructions?
There's mixed opinions about brake bedding, from "not needed" to the "speed up to 60 miles, the brake hard, then repeat ten times"

I just do a couple of medium to hard stops from 15-20 mph going forward and a couple in reverse. The real bedding happens during normal braking over the first 200 miles.
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  #11  
Old 10-25-2010, 11:16 PM
kenza kenza is offline
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Thanks!
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  #12  
Old 10-26-2010, 09:31 AM
hmjfrank hmjfrank is offline
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Rotor Replacement

How do you know if the rotors need to be replaced?

Brake pads are @ 3mm in front and 3.5mm in rear. My X3 has 41K miles. Dealer is recommending replacement of pads, rotors and sensors - at dealer prices. They visually inspected brakes when rotating the tires, but provided no info on the rotors other than to say they recommend replacement.

Is this overkill or can just the brake pads be replaced?

Last edited by hmjfrank; 10-26-2010 at 09:40 AM.
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  #13  
Old 10-26-2010, 10:17 AM
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X3-terrestrial X3-terrestrial is offline
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Quote:
Originally Posted by hmjfrank View Post
How do you know if the rotors need to be replaced?
If they don't meet the min thickness. Are you out of free maintenance I suppose?
BMW rotors, usually will have 1 1/2 the lifespan of a set of pads, so if you keep the same rotors, they will be wear at less than expec when the new pads wear 50%, risking damaging other components (like brake calipers.)
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  #14  
Old 10-26-2010, 10:27 AM
hmjfrank hmjfrank is offline
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Yes, I am 3 months out of free maintenance, of course!

Thanks for your input. I read a few other threads after posting this and saw that it does seem like a good idea to do both unless you are doing maintenance yourself and are keeping a very close eye on things.
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  #15  
Old 10-26-2010, 12:57 PM
kenza kenza is offline
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I am having the same doubts. I am at 70K kms and I guess I will have to replace both rotors and pads. What is the average life of rotors? Experiences?
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  #16  
Old 10-30-2010, 10:33 AM
kenza kenza is offline
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Just checked and I still have 23.6 mm on the front rotors. As my car has 70.000km, it seems
rotors wear 0.2mm per 10.000 km, so I should be ok for more or less 10.000 km more.

Pads have to be changed now.

Now: what would happen if one does not change the rotors when they are at 23.4 mm, but continues to use them
until they are at 22.4 mm? Has anyone done that? I will not try it, but it seems that 1mm is not a big deal...

Last edited by kenza; 10-30-2010 at 10:34 AM.
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  #17  
Old 10-30-2010, 11:38 AM
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The reason for minimum thickness on brake rotors and pads is because you loose some of
your stopping power because of lost heat disipation and also the caliper and piston would be out of its designed travel range.1 mm could be a big deal.
Belated congrats on the baby
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  #18  
Old 10-30-2010, 11:48 AM
kenza kenza is offline
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Thanks X3-po
I can understand the heat dissipation but piston and caliper should be much more extended with 3mm pads than with 23mm rotors and brand new pads. The problem would be when both rotors and pads are below minimum. Does it make sense?

Anyway, I'll change my rotors in 10.000kms more, when they reach the minimum.
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  #19  
Old 10-30-2010, 12:00 PM
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Yes it makes sense when both pads and rotors are below min.Manufacturers have to publish a guideline to cover their a$$(etts)
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  #20  
Old 10-30-2010, 12:16 PM
kenza kenza is offline
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Well said
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  #21  
Old 10-31-2010, 07:04 PM
kenza kenza is offline
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Anyway, I replaced the pads today and will replace the rotors in 10k kms more.
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  #22  
Old 11-01-2010, 06:11 AM
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I guess I have been "lucky". I had my rotors and pads changed underwarranty due to warpage. I had the X3 in twice because 1st they did the fronts then the rears.

75k miles and no change having to pay for anything yet. However, I do a LOT of highway driving in relatively low traffic.
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