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      05-06-2013, 10:46 PM   #23
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Quote:
Originally Posted by CarJunkie View Post
Interesting . . . are these the original pads?
Yes, all OEM brake parts, tyres (just changed to PSS), suspension
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      05-06-2013, 11:50 PM   #24
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Crazy. It is hard to imagine how the rotors could wear out before the first set of pads.
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      05-07-2013, 12:04 AM   #25
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Originally Posted by CarJunkie View Post
Crazy. It is hard to imagine how the rotors could wear out before the first set of pads.
Rotors aren't worn out, they are just not even. Dealer said they are warped, but that's not really possible.
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      05-07-2013, 08:19 AM   #26
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Quote:
Originally Posted by Ian///M View Post
Was in BMW today for other warranty items and they looked at brakes. Rotors are warped, measuring below tolerance ... waiting on warranty reply from BMW.
I took measuring below tolerance to mean they were fully worn.
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      05-07-2013, 09:13 AM   #27
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Quote:
Originally Posted by CarJunkie View Post
I took measuring below tolerance to mean they were fully worn.
I think the thickness varies on different parts of the disc circumference. The rotors aren't warped, rather uneven.
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      05-08-2013, 03:16 AM   #28
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Good read

http://www.stoptech.com/technical-su...nd-other-myths
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      05-17-2013, 02:29 PM   #29
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New Ferodo DS2500's on the front with new rotors. Initial bite is not as good, but when they do bite it is strong with no fade.

Not convinced that the vibrations through the brake pedal are gone though!?!
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      05-17-2013, 06:13 PM   #30
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Thanks for the update Ian. It sounds disconcerting that the issue was not resolved, even with new rotors (my next step).

Since this was undertaken by the dealership, I suppose you have the option of returning. Otherwise I hope other forum posters can provide opinions/experience
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      05-17-2013, 09:20 PM   #31
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Quote:
Originally Posted by timbo_3101 View Post
Thanks for the update Ian. It sounds disconcerting that the issue was not resolved, even with new rotors (my next step).

Since this was undertaken by the dealership, I suppose you have the option of returning. Otherwise I hope other forum posters can provide opinions/experience
No, as I fitted DS2500 pads, I can't go back to dealer. Wondering if it isn't actually the rears

The DS2500's do squeal at very low speeds
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      05-18-2013, 02:08 AM   #32
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If it was the rears, the dealership mechanic would have known eg vibration in seat rather than steering wheel? The other aspect might be to determine if there were any particular issues with the worn rotor (which might subsequently recur) if they haven't discarded this already.

I'm in a similar predicament given how many consumables I have used in such little mileage ...
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      05-21-2013, 05:49 AM   #33
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Quote:
Originally Posted by timbo_3101 View Post
If it was the rears, the dealership mechanic would have known eg vibration in seat rather than steering wheel? The other aspect might be to determine if there were any particular issues with the worn rotor (which might subsequently recur) if they haven't discarded this already.

I'm in a similar predicament given how many consumables I have used in such little mileage ...
Definitely still have vibrations via pedal and perhaps steering too.... I had it when I collected the car, but assumed new pads an rotors would need some miles on them first. WTF
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      05-21-2013, 10:09 PM   #34
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Very interesting ... in retrospect, replacement of my front rotors-pads may not entirely have fixed my issue - so I have to question whether simply buying further equipment (as suggested by one mechanic) will correct the vibration/shudder.
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      05-21-2013, 10:51 PM   #35
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Quote:
Originally Posted by timbo_3101 View Post
Very interesting ... in retrospect, replacement of my front rotors-pads may not entirely have fixed my issue - so I have to question whether simply buying further equipment (as suggested by one mechanic) will correct the vibration/shudder.
Could it be alignment related?
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      05-22-2013, 01:42 AM   #36
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First time I had front rotors-pads replaced, there was immediate resolution. But since then (single track event), I have had rear rotors-pads changed, then new front pads, and there has been no improvement.

Southern BM and BMW dealership and another ... but no one has mentioned alignment yet. Could be worth considering, but sorry I am way out of my depth here.
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      05-22-2013, 03:31 AM   #37
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Quote:
Originally Posted by timbo_3101 View Post
First time I had front rotors-pads replaced, there was immediate resolution. But since then (single track event), I have had rear rotors-pads changed, then new front pads, and there has been no improvement.

Southern BM and BMW dealership and another ... but no one has mentioned alignment yet. Could be worth considering, but sorry I am way out of my depth here.
Could be wheel bearings according to this http://www.brakeandfrontend.com/Arti...questions.aspx

Or the ABS unit
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      05-22-2013, 09:26 PM   #38
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These are the deposits on the rears. Surely not enough to cause vibrations???
Attached Images
  
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      05-23-2013, 03:55 AM   #39
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Quote:
Originally Posted by timbo_3101 View Post
First time I had front rotors-pads replaced, there was immediate resolution. But since then (single track event), I have had rear rotors-pads changed, then new front pads, and there has been no improvement.

Southern BM and BMW dealership and another ... but no one has mentioned alignment yet. Could be worth considering, but sorry I am way out of my depth here.
Thought I'd remove the rears and re torque to 120Nm. Then did same on front... Surprise surprise, dealer had torqued the front nuts at random Nm amounts ...
Vibration gone .... Hopefully stays gone
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      05-23-2013, 07:34 AM   #40
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Okay amazing! I'll have to try this (likely late June 2013), but thanks so much for giving me hope
Enjoy your new race pads without the vibrations!
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      05-23-2013, 07:19 PM   #41
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Quote:
Originally Posted by Ian///M View Post
Thought I'd remove the rears and re torque to 120Nm. Then did same on front... Surprise surprise, dealer had torqued the front nuts at random Nm amounts ...
Vibration gone .... Hopefully stays gone
Really...Amazing.. Can the rims be that sensitive to uneven torque settings?
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      05-23-2013, 07:54 PM   #42
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Really...Amazing.. Can the rims be that sensitive to uneven torque settings?
who knows?

I generally check torque on wheels once a month. Just pathetic that dealer get this so wrong. Even Jax tyres use a torque wrench.
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      05-31-2013, 07:24 PM   #43
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Quote:
Originally Posted by timbo_3101 View Post
First time I had front rotors-pads replaced, there was immediate resolution. But since then (single track event), I have had rear rotors-pads changed, then new front pads, and there has been no improvement.

Southern BM and BMW dealership and another ... but no one has mentioned alignment yet. Could be worth considering, but sorry I am way out of my depth here.
Went for a run through twisties today and still vibes over 90km/h. Pretty sure it is the rears, as vibes through pedal and not the steering. Can feel though the seat. Asked the SA, who said they only checked the fronts.

Car going in to dealer next week for national service manager to drive. Really over this Unacceptable BMW!
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      05-31-2013, 08:48 PM   #44
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Oh, sorry to hear this Ian.
I think the rotor issues with the rears is felt in the seat (?), but am grateful for the updates.
Actually I had new rotors for the rears (changed with pads), but don't think I have ever experience them (rears) failing.

Looking forward to when my baby M is operational (July 2013). In the meantime, a Porsche Tour will have to suffice (Germany-France). Am definitely not looking to change vehicle, but am happy to test competitor's vehicles.
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