Is the dual disc front brake upgrade a big improvement? - Page 2
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Thread: Is the dual disc front brake upgrade a big improvement?

  1. #11
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    radial brakes make good stoppies possible

    till they came out with radial mounting i always had ring twitter while doing a stoppie due to brake chatter
    purplecx500 and Son of eevil like this.
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  2. #12
    Super Moderator Sidecar Bob's Avatar
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    Interesting article. But it didn't address that they were initially developed to overcome the shortcoming of the inverted fork design.

    And from what they said, you will feel a bigger difference replacing the rubber lines with ss braided ones.
    Summer - Mr. Honda ('83 GL1000/Dnepr)
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  3. #13
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    1 finger stoppies, woot!

    Inverted offer less unsprung weight, with the fork thickness nowadays, don't know of a downside.

    Braided lines definitely help with feel, though more from a consistency standpoint, all modern bikes should come with them stock, it's crazy they don't. Personally I'd rather not decide and have both!

    All my bikes have braided, yet the two radials outperform by far. Do they stop me quicker? Probably not really, but the confidence in the feel of them is a good thing.
    Current rides:
    79 Cx500 (blown)
    80 Cx500 deluxe (parts bike)
    00 Aprilia Mille (street)
    07 Daytona 675 (street)
    06 GSXR-750 (track)
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  5. #14
    Senior Member Manzanita's Avatar
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    Quote Originally Posted by spacetiger View Post
    For the MC, you need to pick one that matches the MC piston to the caliper pistons for good brake feel. Front Master Cylinder Ratio Chart
    Jerry
    In this chart, how do you measure caliper diameter? Distance from where to where?
    1981 CX500 Custom
    2014 Zero S

  6. #15
    Super Moderator Sidecar Bob's Avatar
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    Umm.... From one side of the piston to the other... The same way you measure the master cylinder...

    It really should say caliper piston diameter and master cylinder piston diameter. Note that they also specify how many pistons because it is really the ratio of the area of the master cylinder piston to the total area of all caliper pistons (so if you have dual 2 piston calipers that's 4x the area of one piston) that is important.
    Last edited by Sidecar Bob; 10-09-2014 at 09:52 AM.
    Summer - Mr. Honda ('83 GL1000/Dnepr)
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  7. #16
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    Quote Originally Posted by AlanDog View Post
    In this chart, how do you measure caliper diameter? Distance from where to where?
    AlanDog,

    No need to measure for the caliper piston diameter, just look at the caliper body. It has the diameter stamped into it. The number 32, 30, or 25 is the diameter in mm. So, to calculate the caliper area you use this formula:

    Single "30" caliper: Area = number of pistons/caliper x pi x (Diameter/2)^2
    = 2 x (3.14159265359) x (30/2)^2
    = 1,413.72 sq mm

    If you have dual calipers, you multiply the 1,413.72 sq mm by 2 to get 2,827.44 sq mm.

    You calculate the MC piston area the same way. The piston diameter is stamped on the MC. Make sure when you calculate the area, you have converted the piston diameter to mm.

    What size caliper and MC pistons do you have?

    Jerry
    Current 7 bikes:
    2012 Can Am Spyder RT-S (spring F/R changed, Corbin, windscreen w/ vent)
    2009 Aprillia SporCity 250 (suspension F/R, brake mods)
    1996 Honda PC800 (NT650V wheels/17" radial tires, CBR 600 F4 fork, rear shock change, F/R discs upgrades, Corbin, givi top case)
    1986 Honda VF700 (stock, to be sold)
    1984 Honda CB700SC (NT700V wheels/radials, VTR front fork/KYB rear shocks, F/R disc brake upgrades)
    1983 Honda GL650 (FJ1200 rear shock, modified comstars/radial tires and front suspension changes coming)
    1981 Honda CM400A (GL500I front fork, GL1100 front brakes coming)

  8. #17
    Super Moderator Sidecar Bob's Avatar
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    Or just look a the chart that has piston diameter with number of pistons down the left side...
    Summer - Mr. Honda ('83 GL1000/Dnepr)
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  9. #18
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    ... yes, that works too.
    Current 7 bikes:
    2012 Can Am Spyder RT-S (spring F/R changed, Corbin, windscreen w/ vent)
    2009 Aprillia SporCity 250 (suspension F/R, brake mods)
    1996 Honda PC800 (NT650V wheels/17" radial tires, CBR 600 F4 fork, rear shock change, F/R discs upgrades, Corbin, givi top case)
    1986 Honda VF700 (stock, to be sold)
    1984 Honda CB700SC (NT700V wheels/radials, VTR front fork/KYB rear shocks, F/R disc brake upgrades)
    1983 Honda GL650 (FJ1200 rear shock, modified comstars/radial tires and front suspension changes coming)
    1981 Honda CM400A (GL500I front fork, GL1100 front brakes coming)

  10. #19
    Senior Member Manzanita's Avatar
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    Well, it's been 2+ years but I just pulled the trigger on a set of dual disc cb650 forks with single piston calipers and the front wheel ($200 on ebay). These forks were favored over the gl1000 and gl650 forks because the have the front axle on the leading edge of the fork, not the bottom of the fork (thus they match my current existing cx500 custom fork design), and are 35mm diameter.

    After riding my Honda 919 and my Zero S at the track I look back at my old cx500 trackdays and think... "what was I thinking!" But regardless of whether I take the bike to the track again, my taste of bikes with better brakes makes the cx500 brakes seem dangerously bad. It seems now my rear brake has more stopping power than my front.
    1981 CX500 Custom
    2014 Zero S

  11. #20
    Super Moderator Sidecar Bob's Avatar
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    Where the axle is relative to the forks affects the trail. The Custom has more rake so it the leading axle because that reduces the trail. If the new forks are about the same length as the originals a leading axle will be fine. If the new forks are shorter installing them will lower the front end a bit which will reduce the rake angle and reduce the trail.

    FWIW, I needed to reduce the trail on my GoldWing because its original 5.3" was too much with the sidecar and it was very hard to steer at speed. I changed from the original forks that had the axle centred to leading axle forks and reduced the trail to about 4" which I find much better. I would not make a change like that on a 2 wheeled machine.
    Summer - Mr. Honda ('83 GL1000/Dnepr)
    Winter - The Famous Eccles ('84 CX650EI/Veloural)
    Eccles: The Never Ending Build
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