R100GS Nissin 4-piston caliper conversion

Discussion in 'Airheads' started by Solo Lobo, Apr 7, 2005.

  1. Solo Lobo

    Solo Lobo airhead or nothing

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    Rode it in today and now have around 30 miles on the conversion... I would say I'm at true two-finger braking now, and the feel and power keep getting better!

    Nice, progressive feel, much better than stock, and sneaking up on the Harris 6.
    #21
  2. JoeK.

    JoeK. Adventurer

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    Solo - Its been a year since you hit the road with the Nissin conversion, whats your experienced impression now.

    Following your thread I picked up set of calipers for $27.00 last year on Ebay will do this conversion once bike is on the road.

    Big Joe
    #22
  3. Solo Lobo

    Solo Lobo airhead or nothing

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    Joe,

    I love this conversion, and have nothing bad to say about it. I never use more than 2 fingers braking and have plent of stopping power and have't even experimented with different pads, just running the ebay specials I got.

    My only complaint is the 50" line is too long and I have the excess pulled up above the handle bars, I think a 45" line would be the ticket!

    And for under $100 for the change, I would say it's the way to go!
    #23
  4. Tony Graf

    Tony Graf Been here awhile

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    Thanks for the annual report...now it's my turn..:wink:
    #24
  5. Solo Lobo

    Solo Lobo airhead or nothing

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    BTW, If any local airhead riders want to trade bikes for a ride, and give their opinion of this upgrade let me know.

    I'd like to ride a GS w/o the brake line and 4-piston to see what it's like again :evil
    #25
  6. Solo Lobo

    Solo Lobo airhead or nothing

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    TOny,

    Gonna do the Nissin thing?:ear


    #26
  7. Tony Graf

    Tony Graf Been here awhile

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    Absolutely...
    #27
  8. Solo Lobo

    Solo Lobo airhead or nothing

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    Looks like there will be three of us with this conversion on ADVR, another member is having the adapter made soon. Make sure to post your thoughts once it's done and let me know if I am full of shit or not....:rofl

    If you find a source for the caliper bolts that has allen-heads, think of me and buy me the two bolts, I haven't had time to look and the ones I am using offend my aestetic sensibility!

    SL

    #28
  9. cpatstone

    cpatstone N00b, obviously.

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    Solo,

    What you're doing is very cool in my book. But - I read somewhere than an R1100 caliper bolts right on, no funky aluminum adapter required? If so, (again, not to pick on a good idea) why would someone opt for the Nissin option?

    Cheers - chp :ear
    #29
  10. Solo Lobo

    Solo Lobo airhead or nothing

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    Hey CHP,

    All good points, and from what I hear the BMW 4-pot does bolt right on.

    The reasons I went with Nissin are:

    1. Cost - the caliper was $5, and I have a friend w/ a machine shop
    2. Cool factor, making something is cooler then buying it
    3. The Nissin seems to have three benefits over the BMW caliper
    a. cost (mine was $5)
    b. availability (tons of wrecked GSXR's out there, many years used)
    c. differential bore pistons may increase "feel" at the lever as smaller pistons move with less force and sooner then the big ones, BMW has all 4 move at the same time
    d. brakepads on the Nissin have more pad surface area (I believe...)

    At the time I did this I couldn't find the BMW caliper anywhere for less than $200 w/o pads...

    #30
  11. cbmwgs

    cbmwgs Retired Adventurer

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    Where does one get a 15mm Magura master cylinder ?

    Got a part number ?
    #31
  12. Motocicletta

    Motocicletta ridetowork

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    See my post above. Your BMW dealer. You can get a 15mm or a 16mm.

    If you want to keep the stock switchgear gotta use the stock MC, as the brake lever perch has the switches integral to it.

    I use a 15mm with the two pot 48mm Brembo. Stock MC is 13mm. I did this because I never liked the eccessive brake lever travel with the 13mm, it made it difficult to modulate the throttle and brake at the same time. If i've lost some mechanical advantage I might have regained it with a MAP 320mm kit.
    #32
  13. Steve in NZ

    Steve in NZ scared/cheap

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    That first picture/post in this thread looks very like a bike parked in my garage. A guy in Auckland, NZ thought up this mod as far as I am aware. I bought a adapter bracket off him. It was made out of hardened steel and I had it coated. The coating was looking like shit so my neighbour is a tool maker and made me a nice shiny stainless one a few weeks ago.

    Numerous guys have done this mod in NZ.

    I had this mod on my bike about 6 years.

    the old original brake. A more efficent braking system would be to hold ya arms out horizontally, rotate palms forward and cup ya hands. I don't know how many intersections I went past two up cause the brakes didn't work.

    This system has caused me no problems, I am still on the original pads i bought which off the top of me head were EBC, FA105 i think. ??? forgot

    I ride numerous gravel roads and have never had a scary moment or had the front brake lock. Remember that if you make the brake to efficent in the gravel, you may end up inspecting the road with brake that works to well.

    I run Pirelli Scorpion tyres and get about 10-12000kms on a rear and 15000kms on a front. I have never really had a scary moment on these tyres and if you have ridden in NZ trucks love leaving Diesil on the road. I wouldn't use them in situations where mud is abound but gravel is fine.

    this old pig has put the frighteners up many sports bikes in the twisty stuff after i have come off a secton of gravel as ya confidence is on a high, when coming back on the seal.

    Steve

    PS. Why clean it it is only gunna get dirty the next time I take it out.

    heres a recent ride. http://www.advrider.com/forums/showthread.php?t=133052

    Attached Files:

    #33
  14. Solo Lobo

    Solo Lobo airhead or nothing

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    Steve,

    That is your adapter in the first picture of this thread! It's the one that gave me the idea to try it myself. In the end yours does look better than mine!

    Great to hear from you, make sure to thank whoever thought of this over in kiwiland, I hope to make it back over your way again one of these days.

    SL
    #34
  15. Solo Lobo

    Solo Lobo airhead or nothing

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    Here's a shot almost one year later..

    Attached Files:

    #35
  16. El Hombre

    El Hombre Banned

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    Does the caliper actually pivot on the adapter, or do the bolts hold it tight? The deal on master cylinder piston size is the smaller one gives higher pressure with the same squeeze on the lever, but less volume of fluid per mm of movement compared to a larger diameter. If you want power brakes go with the smallest one that won't bottom out against the grip.

    I've been thinking of changing the front brakes on my R90s, back in 1980 there was one racing that used Lockheed calipers on hangers that pivoted on the front axle and had a pushrod that attached to the lower fork crown. This gave an anti-dive effect. Looks pretty cool too. But I like the way you guys have used the Japanese calipers.
    #36
  17. Solo Lobo

    Solo Lobo airhead or nothing

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    No pivot:D .... I do need to find a 45" line, the 50" one offends my aestetic sensibilities:rofl

    No issues with my master cylinder, the level cannot be pulled all the way back to the bars, and I never use more than two fingers braking (and can lock the front tire)
    #37
  18. Solo Lobo

    Solo Lobo airhead or nothing

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    So, did any of you guys that requested the CAD drawing of the adapter ever get to making one ????

    Just wondering if there more than two of these conversions our there!

    BIG JOE, TONY WHERE YOU AT?????

    :ear :ear :ear
    #38
  19. Steve in NZ

    Steve in NZ scared/cheap

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    come to NZ ther are heaps of these conversions
    #39
  20. Zebedee

    Zebedee Been here awhile

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    ... I was born a ramblin' man
    Steve called round to my place at the weekend, and I had the opportunity to measure up the adapter from his bike, as a result I’ve just got the price back from the engineers.

    Grade 6061 Aluminium, CNC milled with radiused ends and blind threaded hole for the fork leg fixing bolt. Basically, los cojones del perro.

    Price - $50 kiwi, or about £ 17.50 sterling, $ 35 US, € 26.50 at today’s rates + P&P.

    Send me a PM if you’re interested … I might even be persuaded to email out a PDF for a small contribution made on my behalf to ADVrider for the yanks or to the BHT at UKGSer for the POM’s.

    Regards

    John
    #40