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Old 04-14-2005, 04:12 PM   #16
GSPD750
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Quote:
Originally Posted by SOLO LOBO
Just rode a '92 R100GS with a Harison 6 that was fully beded in (around 4k miles??). It was super-dooper!, when my Nissin has more miles on it I expect it will be 85% of a Harison...... no single finger front wheel lock ups, but much improved over the stock.
More to come as I ride it more!
Good news Solo.
Sorry for being a bit too judgemental in my last post.
Like a fine wine it needs to age. I'm likeing your mod
more and more. I was never totally satisfied with my 4 pot brembo, just seems like it could have been better. And i'm not convinced that if i upgrade to a 15mm Magura master cylinder that it will improve mine.
Anyone here use a 15mm mc on their airhead? I'm lucky if mine improved 30%...but any improvement is better than that anemic 2 pot stock brembo. The twin disc on my Africa Twin has spoiled me.
regards.
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Old 04-14-2005, 04:20 PM   #17
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If I was worried about being judged, I wouldn't be here, no worries.


I haven't heard about anyone using the 15mm, but I believe that my last bike a 1995 R1100RS has a 20mm or 21mm master cylinder piston. Isn;t the rule the large the bore, the higher the fluid pressure and therefore greater braking? (with some potential loss of "feel"?)
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 04-15-2005, 08:51 AM   #18
Motocicletta
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15mm Magura MC

Im using this front brake system:

320mm MAP Eng. disk, bracket & SS line
Stock 2 pot Brembo caliper 42mm pots
Black Galfer pads
and 15mm Magura master cyl.

I was always annoyed at the large amount of lever travel on the GS ('88 R100). Repeated bleeding with the pistons retracted, speedbleeders, rebuilding the caliper, making sure that the caliper was reasonably centered on to the disk only helped a little. The SS line was the best improvement of all this.

Started thinking about mc to caliper bore ratios and vintage brake publishes a chart. According to their chart the 13mm in right for the 13mm master with the 2 42 mm caliper pistons.

Then I spoke to a racer engineer friend who quickly did an excel chart showing that vintage brake is just off, and that I should use a 15 or a 16 mm master cyl., both of which are available at the dealer.

After years of just too much lever travel the 15 just works. No pinched fingers, the ability to modulate the gas while braking, if some power was lost it was regained by the larger disk. Galfer green were a little to grabby, the blacks have less bite more gradual.

On the Galfer greens: too thick and forced the floating disk to be asymmetrical in the caliper and keeping a piston retracted.
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Old 04-15-2005, 04:44 PM   #19
GSPD750
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[QUOTE=Paolo Sant'Ambr]Im using this front brake system:

320mm MAP Eng. disk, bracket & SS line
Stock 2 pot Brembo caliper 42mm pots
Black Galfer pads
and 15mm Magura master cyl.
QUOTE]

Thanks for the great input Paolo. Maybe its time to source me a 15mm Magura. Speigler USA had them at a blowout price
awhile back on their website, but now i don't see them there anymore.
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Old 04-16-2005, 05:34 PM   #20
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Thanks for the great input Paolo. Maybe its time to source me a 15mm Magura. Speigler USA had them at a blowout price
awhile back on their website, but now i don't see them there anymore.[/QUOTE]


Got to use the BMW master by Magura if you want a 15mm because in the GS (all I think) the MC is integral to the switchgear, it is not a standard clamp & 2 bolt mount.
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Old 04-19-2005, 08:28 AM   #21
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Even Better!

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.
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 04-24-2006, 07:13 AM   #22
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A year later

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
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Old 04-24-2006, 08:49 AM   #23
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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!
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 04-24-2006, 10:25 AM   #24
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Thanks for the annual report...now it's my turn..
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Old 04-24-2006, 04:13 PM   #25
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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
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 04-27-2006, 09:05 AM   #26
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TOny,

Gonna do the Nissin thing?


Quote:
Originally Posted by Tony Graf
Thanks for the annual report...now it's my turn..
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 04-27-2006, 01:34 PM   #27
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Absolutely...
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Old 04-27-2006, 02:01 PM   #28
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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....

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

Quote:
Originally Posted by Tony Graf
Absolutely...
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 04-27-2006, 02:32 PM   #29
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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
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Old 04-27-2006, 03:57 PM   #30
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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...

Quote:
Originally Posted by cpatstone
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
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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