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  1. #1
    Member
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    02.14.19
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    Bloomington, Indiana
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    Default Best Girling Master Cylinder size

    Hey gang-Quick question. I have a 1972 Merlyn Mk20AS, I have enjoyed racing it and learning FF after 15 years with the Bugeye, but I have noticed that some items on the car perhaps, should be looked into before just replaced. My example-I need to replace the front brake master cylinder -and it is a Girling, I have not yet checked the bore size, but other than just matching it, (as it could have been replaced with the incorrect size), I wondered if this group would know what the size should be for the front and rear bores of each of these? It appears I have the Girling LF14 calipers front and rear-number DA21768 at each. As I replace the pads with new-should I replace the rotors too-and I assume those are easily done with Triumph Spit MKIV ones?

  2. #2
    Senior Member kea's Avatar
    Join Date
    12.17.00
    Location
    madison heights,mi
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    Liked: 625

    Default Master Cylinder

    Master cylinder size. Smaller front then rear.
    Probably 5/8" bore front, 3/4" bore rear.
    The brake disc may not be a street item.
    Often (not always) those street applications used brake disc that had a smaller OD then what we run on our FF.
    Besides having Girling masters, I also have KFP Magnum brake pads for your application.
    Keith
    Averill Racing Stuff, Inc.
    www.racing-stuff.com
    248-585-9139

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  4. #3
    Senior Member
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    10.05.01
    Location
    Milan, MI
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    Default

    I highly recommend buy Girling. I have been very disappointed with Wilwood so don’t go cheap.

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  6. #4
    Contributing Member Garey Guzman's Avatar
    Join Date
    09.09.02
    Location
    Murfreesboro, TN
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    Default

    Kieth has the size data and Dave makes a great point about quality.
    I will add that if I am happy with the balance and performance of my systems, which ever one I'm working on, I exchange like for like to keep it the same. If something is changed, it will likely require a fair bit of focused attention to get back in the sweet spot.
    Garey Guzman
    FF #4 (Former Cal Club member, current Atlanta Region member)
    https://redroadracing.com/ (includes Zink and Citation Registry)
    https://www.thekentlives.com/ (includes information on the FF Kent engine, chassis and history)

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