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Thread: Alternative Rear master cylinder

  1. #1
    apriliaforum Member
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    Alternative Rear master cylinder

    Has anyone done the mod to fit a ducati 848 rear master cyclinder in place of the OEM and maintained the OEM footpegs? If so do you have any photo's and were there any issues with the orignal brake plunger?

  2. #2
    apriliaforum expert tmtuono's Avatar
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    I replaced mine with a BMW unit. The BMW unit was slightly smaller diameter and had a pin on the piston that limited piston travel. I'm assuming the pin was to limit volume and consequently max pressure. Anyway, after some measuring and figuring piston travel volume I trimmed the pin to give the same volume of fluid moved as the stock unit. The goal was to move the same amount of fluid but under higher pressure (smaller diameter piston). That was several years ago the the system works as expected. Don't know the specs for the Ducati cylinder. Also don't remember the exact specs for the Aprilia or BMW piston size but they're around here somewhere.
    see ya later,

    tony
    '03 Tuono Magnet Grey
    '05 BMW BCR '07 R1200S '78 R100
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    But Officer, I got here as fast as I could.

  3. #3
    apriliaforum expert madart's Avatar
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    I replaced the rear caliper with a Ducati one. There is no difference between the standard caliper and this, except the inlet and bleed nipple are reversed, so the nipple is higher.
    You can reverse these on the standard caliper.

    Using the standard master, it was the end of my rear brake woes.



    Sent from my SM-G975F using Tapatalk

  4. #4
    apriliaforum Member
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    I am interested in this mod too.

    @madart - would you have any picture please?

  5. #5
    apriliaforum Member
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    I am little bit lost now. I do not know what to change, master cylinder from Duc 848 or rear caliper?

  6. #6
    apriliaforum expert kzmille's Avatar
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    If the caliper is not leaking and the pistons are not stuck then there is no reason to replace it.
    This is America. Use your turn signals or WE WILL KILL YOU - remember Sandra Bland

  7. #7
    apriliaforum expert JMH's Avatar
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    Quote Originally Posted by kzmille View Post
    If the caliper is not leaking and the pistons are not stuck then there is no MECHANICAL reason to replace it.
    Fixed it

    Other reasons, such as star alignment and the color of your socks, are easy to find.
    Mille Aarrr -02 (1060 BB, Gen2 heads, 2-2 Akra, timed cams, bespoke Gabro chip + TSS slipper) & KTM 625 SXC -05
    My riding lines are like Hendrix's solos. Unexpected and always different.

  8. #8
    apriliaforum expert tmtuono's Avatar
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    I swapped mine because it was Tuesday.
    see ya later,

    tony
    '03 Tuono Magnet Grey
    '05 BMW BCR '07 R1200S '78 R100
    ------------------------ ------------------------ ------------------------ ----------
    But Officer, I got here as fast as I could.

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