[E46] Easy Rear Brake Upgrade? Whats the options?

Discussion in 'Engine maintenance, upgrades and modifications' started by Loony, Apr 17, 2019.

  1. 17 Apr 2019 at 11:47 AM #1
    Loony

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    Gots some 6 pot D2 fronts and wanted to upgrade the rears.

    Are there some simple inexpensive options you can recommned?

    Thanks

    Mark
     
  2. 17 Apr 2019 at 6:48 PM #2
    M3Chas

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    Z4M/CSL Rear Calipers have larger pistons than the stock M3 items, which may help things on the rear
     
  3. 17 Apr 2019 at 7:27 PM #3
    Loony

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    OK, but after some diameter and maybe a 4 pot caliper....

    The only one ive seen is the AP Kit :(
     
  4. 17 Apr 2019 at 10:49 PM #4
    M3Chas

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    Remember in a 4 pot, 2 of the pistons are reactive to the opposing pistons.

    This is why in Effective Piston Area calculations, single piston sliding calipers are assumed to be a "2 piston" caliper. After all, it's Newton's Third Law. Of course, it's not quite that simple.

    From memory, stock M3 calipers are 43mm, and the CSLs are 47mm.
     
  5. 18 Apr 2019 at 11:19 AM #5
    Loony

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    Are the pads different? Or do i have to change the calipers and the carrier?

    thanks
     
  6. 18 Apr 2019 at 9:05 PM #6
    mickeya5

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    Hi they are the same shape as I have csl rear calipers with normal m3 performance friction pads .I believe genuine csl pads are a different compound to normal m3 thoughI don't think I changed the rear carriers though ,was a while ago though!!
    cheerzz Mickey
     
  7. 20 Apr 2019 at 3:02 PM #7
    FrazerD

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    Depends how upgraded you want them? Track or road driving. Personally I would get them refurbed, braided lines and good pads.

    Cheers :thumbsup:
     
    Last edited: Apr 20, 2019
  8. 20 Apr 2019 at 3:43 PM #8
    ADL

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    ap 5144 callipers utilising the standard disc for £850 ish would get my vote
     
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  9. 21 Apr 2019 at 4:40 AM #9
    DaveMSport

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    There's not many upgrades that increase disc size at the rear. I've E92 M3 discs all round and using R35 GTR calipers at the front and 911 GT3 at the back.


    The most straightforward upgrade for the rear is either;
    996 Boxter S calipers with 996 front pads, brackets and lines from the likes of Rallyroad on standard E46 discs

    AP calipers as mentioned with standard discs.

    Or just upgrade the orginal brakes with braided lines, upgraded bushes or CSL calipers.




    To be honest, the rear bbk is just for cosmetics 9 times out of 10
     
  10. 23 Apr 2019 at 11:37 AM #10
    Loony

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    Thansk for this I will see what the braking is like on track paired with my D2 6 pots and standard rears then have a look at the brembo option.

    Perfect
     
  11. 28 Apr 2019 at 11:54 PM #11
    M3Chas

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    Rear calipers ar the same for a CSL and M3. It's the fronts that differ. In a nutshell this is the CSL brakes:

    • Fronts: Larger Carriers, stock calipers
    • Rears: Stock Carriers, larger piston Calipers

    The stock E46 M3?
    • Fronts: Smaller Carriers, stock calipers
    • Rears: Stock Carriers, smaller piston calipers.
     
  12. 10 May 2019 at 6:22 PM #12
    sydown

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    I’d stick with what you have just better pads, stainless braided lines and motul rbf600 fluid!! You won’t cook them on a track day!!
     
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  13. 11 May 2019 at 10:36 AM #13
    m3rosco

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    Just decent pads. And braided lines if you haven’t already.

    I use AP pro5000r 6 pot calipers in front, with btcc pads and 368mm discs. I have standard discs and calipers on the rear with Pagid RS29 pads. Performance and balance is spot on, even on track.

    In my opinion a rear BBK really isn’t “needed” but if I was to go down that road I’d just go for the AP kit that uses oem discs. You could go the Porsche Boxster S rear caliper route, but by the time you’ve got the calipers, had them refurbed, got brackets etc you’d nearly be at the cost of the AP rear kit, and the Porsche kit would always be inferior.
     
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  14. 11 May 2019 at 5:37 PM #14
    Loony

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    Will go down the line of some uprated pads then ;)

    Thanks for input
     

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