Audi A4 brakes on my 308? | FerrariChat
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Audi A4 brakes on my 308?

Discussion in 'Technical Q&A' started by papparazzi, Jun 5, 2009.

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  1. papparazzi

    papparazzi Rookie

    Nov 12, 2004
    43
    Carlisle, MA 01741
    Full Name:
    Christian Delbert
    #1 papparazzi, Jun 5, 2009
    A mechanic I use replaces the ATE 308 front brakes with Audi A4 brakes. A friend of mine who had the modification performed says they fit with no modification. I tried his car and found the braking to be 50% more efficient ( feel-wise). Less pedal pressure and "perhaps" shorter stops. Anyone know anything about this?
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,883
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Jun 5, 2009
    Is this using the "stock" A4 floating brake caliper? Do you know the diameter of the stock A4 brake piston?
     
  3. hanknum

    hanknum Formula 3

    Nov 1, 2003
    2,050
    Santa Barbara
    Full Name:
    Henry
    #3 hanknum, Jun 5, 2009
    Yes, tell us more.
     
  4. papparazzi

    papparazzi Rookie

    Nov 12, 2004
    43
    Carlisle, MA 01741
    Full Name:
    Christian Delbert
    #4 papparazzi, Jun 5, 2009
    Sorry, I was asking if anyone on this site had the job done or did it himself. The person I know who had the job done is not mechanically inclined and wouldn't know how to remove the front wheel. So, let's hope someone on this site has had it done and will furnish more information. The "Ferrari" shop that performs the swap is IFR(independent Ferrari Service)out of Easton, MA. Excellent mechanic, by the way!
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,883
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #5 Steve Magnusson, Jun 5, 2009
    Last edited: Jun 5, 2009
    AFAIK, such a change has never been posted/discussed here before. The reason I asked about the piston size is that, if the A4 brake piston is larger, this will give additional mechanical advantage so the pedal effort will "feel" (and be) reduced for the same braking force (even though the pedal travel will be increased). However, the coefficient of friction of the pads could also vary a lot so, if your friend is running a very aggresive metallic pad (without concern for rotor life), the difference in feel could just be that alone. If you get some more details please post. Based on the photos at this site:

    http://johnvey.com/features/a4brakes/

    nothing jumps out at me that says "impossible", but it all depends on the various dimensions.
     

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