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Thread: Dual Piston Upgrade 1980 Cm400T

  1. #1
    FastDemise's Avatar
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    Dual Piston Upgrade 1980 Cm400T

    I have a 1980 CM400T and just upgraded from single piston to Dual piston brakes. Most any of the dual piston bikes from the later years will work as long as you make sure you get the bracket as well. I used a Honda VT 1100 Shadow 1985-86 front left dual piston w/bracket and worked like a charm. Also compared it to the CM400C dual piston brake and it's identical. I also believe certain models of the Goldwings had dual pistons. You just need the left one of course. I hope this isn't all old news to some and this helps someone out.
    1980 CM400T
    78/118
    83 VT750 Headlight.
    GM Duralast Coil Upgrade
    81 CB750 Rear shocks
    85 VT 1100 Dual Piston Caliper
    GZ250 Brake Master Cylinder
    Slipstreamer S06 Shield

    1979 CB400T
    85/118
    Rusted out Exhaust

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  3. #2
    Super Moderator J-T's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    Thanks for sharing. Very nice to know.

    Did you notice any difference?
    JT
    81 CM400T Under re-construction
    82 GL500

  4. #3
    FastDemise's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    Have no ridden it yet but it's a immediate difference in the brake lever. With the old caliper I could squeeze the brake hard enough to almost touch the grip. Just swapped in the dual and 10sec bleed no soft brake at all. I already replaced the degrading rubber brake hose with a custom made stainless one and was really cheap on eBay. I installed the mostly worn old pads that came with the caliper at the moment. If I notice a positive change then it speaks very loudly about the upgrade. I just need to find a master cylinder as cheap as I did this caliper.

    I must say I am in love with my CM400. It reminds me of my Jeep Cherokee. So many other models of Honda bikes have similar parts that I can upgrade and change out parts to improve my bike as I see fit. Same as my Cherokee with the many years and models.
    1980 CM400T
    78/118
    83 VT750 Headlight.
    GM Duralast Coil Upgrade
    81 CB750 Rear shocks
    85 VT 1100 Dual Piston Caliper
    GZ250 Brake Master Cylinder
    Slipstreamer S06 Shield

    1979 CB400T
    85/118
    Rusted out Exhaust

  5. #4
    yayupp's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    Do you know hole spacing on the mount? I've been trying to find a front brake for my '78 CB400T. I have not been able to find an exact answer for my specific model and I don't want to just start throwing away money.

  6. #5
    billybigmac's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    my 78 could use this as well

  7. #6
    TheKurgen's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    Has anybody figured out if the dual piston caliper setup will work on a 1978 CB400TII?

  8. #7
    Super Moderator longdistancerider's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    yayupp, billybigmac, TheKurgen
    Yes this will work on your bike. In 1981 most of the CM/CB models, not all, had gone to dual piston calipers.
    Improvements for the braking system are:
    Throw those 30 year old pads that look good away.
    Replace that 30 year old rubber hose in the garbage and install a SS braided hose
    Rebuild or replace the master, any 5/8" master will work as long as it uses the 10mm banjo bolt(almost all do)
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

  9. #8
    Super Moderator HerrDeacon's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    That is very cool, love to hear your review once you've had some seat time with the new brakes.
    Perry

    1972 Honda CB350 / 1982 Honda MB5 / 2009 Suzuki Gladius / 1978 Honda XL250S

  10. #9
    lynjed's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    hi,
    even more stopping power can be added by swapping the master cylinder - the Goldwing one again will fit but has a piston much bigger, moves more fluid with less effort - all early cb,s use the small piston version, dropped after the range ended.
    even better swap it out for something more modern - I use one from an Yamaha R6, with goodridge hoses onto twin CB1 calipers - the bike will stand on its nose if req!
    j

  11. #10
    TheKurgen's Avatar
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    Re: Dual Piston Upgrade 1980 Cm400T

    Longdistancerider, thanks for your help. I seem to be having trouble with the bracket and caliper however; I managed to find a dual piston caliper and bracket off of a 1982 CM450T and I am confused as to how the bracket mounts. Either way I try to mount the bracket, whether it's on the outside of the forks or inside the caliper does not seem to align properly with the brake rotor. Would I have to swap the CM450T rotor onto the CB400T? I appreciate the help!

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