2nd Gen JCW Pads yes, but rotors?

Discussion in '2nd Generation: 2007+ R55 through R61' started by 05r50, Apr 23, 2012.

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  1. 05r50

    05r50 Well-Known Member

    Dec 4, 2010
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    So looking for input here. It is time to do a brake job on the JCW, considering the original pads lasted 82k miles!

    What I am wondering is if I should bite the bullet and replace the rotors as well since I will be there anyway?

    The rotors look good, but I didn't check the remaining thickness on all four.

    I did measure one of the front rotors in about 4-5 different locations and found on average that I had about 0.4mm of thickness remaining before I would be down to the minimum recommended in the Bentley manual.

    I don't have unlimited budget, but is this something I have to do now or just convenient since I will be working on the car anyway?

    Since I would be looking to save a little, what rotors would be a good option that come in less than OEM JCW rotors?

    No plans for tracking the car. Just daily driving fun.
     
  2. minimark

    minimark Well-Known Member

    Jun 24, 2009
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    Change the rotors too. Centric rotors are very good and reasonably priced....and they are even track rated. 2cents
     
  3. Mr. Jim

    Mr. Jim Mudshark
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    Yep, change rotors while your in there.
     
  4. Crashton

    Crashton Club Coordinator

    Jun 4, 2009
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    Yes rotors too. Brakes are not a place to try & save money....
     
  5. BThayer23

    BThayer23 Well-Known Member

    Jun 12, 2009
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    BMW rotors are soft and meant to be changed with the pads. Change both.
     
  6. Crashton

    Crashton Club Coordinator

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    Not sure how soft they are, but rotors are a wear item like pads. Wonder what their Rockwell hardness is.
     
  7. Rawhyde

    Rawhyde Active Member

    Apr 7, 2012
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    You're down to .4 mm over the minimum recommended thickness. That's cutting it pretty close. In English units, that's .016 inches. The average human hair is .002-.004 thick.

    BMW (and MINI) place a premium on braking performance. I am not a brake engineer, but there are numerous trade offs when designing a braking system. Some generalities (not necessarily true in every case, but true in general):

    The better the car stops, the dirtier the wheels will be from brake dust.

    The better the car stops, the noisier the brakes will be in regards to groaning, squealing, etc.

    The better the car stops, the less long (per unit of thickness) the pads will last.

    The better the car stops, the shorter the life of the rotors.

    You're within a few hairs of having rotors worn down to minimum spec. If you can afford to, get new rotors. If you have to wait for a while, you'll probably be ok because there is a factor of safety incorporated into the minimum spec. I'm using too many words here, but your rotors aren't going to implode as soon as you wear off another .004".

    Also be aware that various car manufacturers specify different compositions of cast iron for their rotors. Chances are that an aftermarket supplier is going to sell you a harder rotor so it will last longer, but changing that composition can affect your stopping distances. I'm not attacking BBK's, but just casting a suspicious eye on "parts store lifetime warranty replacement rotors".

    Please don't think I'm trying to be a know it all, but my first job out of college was a Preventive Maintenance Engineer at a large foundry that made brake drums, rotors, calipers, and anchor brackets. Since I was already a lifelong gear head, I tried to learn as much as I could about our products.
     
  8. Steve

    Steve Administrator
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    Apr 23, 2009
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    People are making good points here but if you only checked one of the fronts I would check the other as well. The wear level is likely to be similar but you might find the other front rotor is already at/near/past the recommended minimum, or you might find the one you measured is the worst one on the car.

    I'd definitely check the rears as well before buying replacements. So far in my experience I've needed to replace front pads and/or rotors almost twice as often as rears on every car I've owned.
     
  9. eMINIparts

    eMINIparts Well-Known Member
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    Mar 13, 2012
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    At this point it makes more sense to replace the rotors as well. Your wear is enough that it would be better to put a new surface on a new surface. Have more even wear on your new pads, and save the life of your new pads, sensors, and rotors.

    If you decide to stay with OEM, please check out our site! We offer OEM parts at a discounted price! Here is a link to the page with front rotors for your MINI. :D

    MINI Parts -
     
  10. Minidave

    Minidave Well-Known Member
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    Check with the dealer for a deal on pads/rotors, they offer kits now with all the sensors, pads, rotors, the Torx screws, anti-squeal grease etc, all for competetive prices.....and they're factory original parts.

    I try to use all factory parts on my cars - nothing against aftermarket stuff, there are some great suppliers out there, but that's just my preference.
     
  11. eMINIparts

    eMINIparts Well-Known Member
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    Well Minidave..... then you should check out our site we offer OEM MINI parts at a discounted price. The same parts you get at your local dealer , only we offer a discount off of true MSRP.
     
  12. N2MINI

    N2MINI MINI of the Month

    Dec 4, 2009
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    Whew!!! 82,000 miles on the front and rear... and wore out at the same time.. I'm guessing mostly highway miles???
     
  13. Firebro17

    Firebro17 Dazed, but not Confused
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    Zimmerman makes a great set of rotors for the MINI. Made in Germany of quality materials, they have been an asset to my car after installing them a year or so ago...
     
  14. Minidave

    Minidave Well-Known Member
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    Sorry, didn't mean to step on an Alliance Vendor's toes there.......I just installed a set on a club member's car the last club shopday we had and he was showing me the deal.....

    A second on Zimmerman rotors. I put a set on the wife's Audi along with some Akebono pads, cut the dust on the front wheels to almost nothing.
     
  15. JMC40

    JMC40 Well-Known Member

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    I installed at set of Centric Rotors and Akebono pads on my Brothers' MINI last year and he has been extremely happy with the setup. As Minidave said almost no dust.
     
  16. Dave.0

    Dave.0 Helix & RMW Powered
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    Alwawys do new rotors with new pads and with 82 k on the car it needs them for sure.

    Zimmerman rotors are good and you can get they from WMW / Walyan.

    OEM blah
     
  17. GokartPilot

    GokartPilot Well-Known Member

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    I was amazed 82K on the originals! I changed mine at 45K, now I can't get the front to stop squealing when apply light pressure, driving me nuts.
     
  18. Way Motor Works

    Way Motor Works New Member

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    I'd suggest our EBC redstuff pads, they are great with great feel, and low dust, and affordable price.
    Then for Rotors we have been very happy with the Zimmermans, then we have the TSW rotors for a much lower cost. And we just got our WMW drilled and slotted OE quality rotors that will be $200 for a pair, will be on the site soon.

    Also FYI the front rotors from an R56 S are the same as an R53 JCW rotor.
     
  19. iwashmycar

    iwashmycar Active Member

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    I am going through the same mental debate on my FJ at 60K miles. Rotors look amazing (as far as even wear), but the pads are almost gone. This is a good thread, with many good points.

    At the rate they last, you can get what, at least 4 YEARS out of some new rotors and probably pads.... might as well change them out for fresh ones. Spending a couple hundo for that much use seems well worth it IMO, and I was about to order pads only just yesterday. Might as well pony up and do it all! Plus you'd probably need to at least turn the old ones, which will cost a little anyway.

    I am going with Centric stuff, with StopTech being a division of them, they certainly make some good stuff. EBC was on my short list, but the Customer Service horror stories have finalized my decisions lol.
     
  20. 05r50

    05r50 Well-Known Member

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    Update: Brake job.

    Thought I would give a little update on the brakes. Thanks to everyone for their input.

    In the end I went with products from DetroitTuned. Mainly because of Chad and DT being close to me so if there were problems...... (ohio/michigan).

    Chad provided SP Performance rotors and Hawk HPS pads. I also went with SS lines.

    I replaced all but the lines over the last week as time allowed. Everything seems to be in working order, but I have noticed that the right rear brake does not seem to be working correctly and am looking for some thoughts and feedback.

    The other rotors/pads seem to be bedding correctly. Very uniform wear taking off the protective coating on the rotors. The right rear however is only making contact on the outer edge of the outside and the innermost part of the backside. See photo.

    Had my friend help me out and he did a few handbrake stops to see if he could lock up the right rear wheel. No luck. It did grab, but not lock. The left wheel would grab and lock no issues.

    I haven't changed the lines/bled system as I have not had time. So right now I am wondering if it is merely-

    1. the line needs bled.
    2. the caliper is not working correctly
    3. the rotor is warped and the pads are not contacting because of that.

    Thoughts?
     

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