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Fitting R6 blue spot caliper to a 1981 XJ550 Seca

Discussion in 'XJ Modifications' started by whiteboxer29, Jun 16, 2020.

  1. whiteboxer29

    whiteboxer29 New Member

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    I've just finished my XJ550 brat / cafe build and went out for a test ride. I wasn't happy with the stopping power of the standard front brake so I picked up a used 4 pot front caliper from a R6. It's a fairly common upgrade for the RD250/350LC and they use the same original caliper as the Seca.
    I've had a billet adaptor made up and did a test fit today. It all lines up nicely so I'm rebuilding the caliper with new seals etc and I already have a braided hose. Hopefully should have it all back together this week.
    I'll upload some pics and an update when it's done.
     
    whiteboxer29, Jun 16, 2020
    #1
  2. dkavanagh

    dkavanagh Well-Known Member Premium Member

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    Does it require an MC upgrade? Pushing more fluid, I assume requires a MC with a larger bore?
     
    dkavanagh, Jun 16, 2020
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  3. whiteboxer29

    whiteboxer29 New Member

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    I'm hoping the original 1/2 inch master should be ok. If not I've got a spare 5/8 master from an old project so I can try that. I've got a feeling the 5/8 might feel a bit wooden with a single caliper though. I'll update once I've fitted the caliper.
     
    whiteboxer29, Jun 16, 2020
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  4. whiteboxer29

    whiteboxer29 New Member

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    So I got the R6 caliper fitted and all seems good. I'm using the original 1/2 inch bore master cylinder and I have a nice firm progressive feel at the lever. Went for a short ride to get the pads bedded in a bit and it's a big improvement over the original set up. XJ550 051.jpg XJ550 052.jpg
     
    whiteboxer29, Jun 17, 2020
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    chacal and Franz like this.
  5. dkavanagh

    dkavanagh Well-Known Member Premium Member

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    nice! Are plans for that adapter available, or did you CAD that up yourself?
     
    dkavanagh, Jun 17, 2020
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  6. whiteboxer29

    whiteboxer29 New Member

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    I bought the adaptor from NK Racing. www.nkracing.co.uk
     
    whiteboxer29, Jun 17, 2020
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  7. dkavanagh

    dkavanagh Well-Known Member Premium Member

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    WOW! that site is so 1997!
     
    dkavanagh, Jun 17, 2020
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