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-   -   R100GS Nissin 4-piston caliper conversion (http://www.advrider.com/forums/showthread.php?t=75031)

SOLO LOBO 04-07-2005 10:21 AM

R100GS Nissin 4-piston caliper conversion
 
OK, first here is the picture that made me think "why can't I do this?, I'm really cheap and this looks very doable!" (picture from an ADVR member Steve in NZ...)

http://gspd750.smugmug.com/photos/15949918-M.jpg

SOLO LOBO 04-07-2005 10:22 AM

Parts list
 
Here is what you need to buy, and where I got my stuff:

Nissin 4-piston caliper conversion for R100GS<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

<o:p></o:p>

DISCLAIMER:<o:p></o:p>

<o:p></o:p>

I am not a mechanic, engineer, or expert in any way in any issue related to brake conversions. I do not know if this conversion is safe, or even a good idea. Proceed at your own risk! This may be a really bad idea! Just because I did it doesn't mean you should even consider it!<o:p></o:p>

<o:p></o:p>

Parts list

**EDIT added 03/17/2008***

ADV Member HPMGuy is producing the adapter that is mentioned below. Please send him a PM or email if you are interested in one... the plans are below for any "do-it-yourselfers".... Guy's work is first rate :thumb **end edit***

<o:p></o:p>

Caliper: Nissin 4-piston fitted to Suzuki GSXR's 92-93 600cc, 88-93 750cc and 89-92 1000cc. As these are mounted behind the fork leg on the GSXR's, and in front of the legs on the BMW be sure to buy the left front caliper as you will be turning it around to mount on your BMW. Got mine off eBay for $5, expect to pay up to $25<o:p></o:p>

<o:p></o:p>

Stainless brake line: The stock BMW line to the steel hard line won't work. I bought a 50"? ss line off of eBay for $25. I think one as short as 45"? may be fine. This length allows for the line to be run through the fender like the stock line and routed right up to the stock master cylinder.<o:p></o:p>

<o:p></o:p>

Brake Pads: I bought a set of EBC FA145's, and believe the other options are: <o:p></o:p>

SBS624, Vesrah VD 343, DP DP213 and Ferrado FDB557. <o:p></o:p>

Check to make sure. I got two sets of EBC's off ebay for $25.<o:p></o:p>

<o:p></o:p>

Hardware:<o:p></o:p>

Upper bolt to attach the caliper to the fork leg I used the stock BMW caliper bolt and tapped the aluminum chunk for it. M10 x 1.5 (30mm)<o:p></o:p>

<o:p></o:p>

Upper bolt to hold the alum adapter to the upper caliper mountNo stainless Allen-heads available in this size says my source. The only choices were black Allen-heads that seem to rust if shown a picture of water and what you see in the picture. M10 x 1.25 (40 mm)<o:p></o:p>

<o:p></o:p>

Lower bolt to hold the lower caliper mount to the fork leg­ - No stainless Allen-heads available in this size says my source. The only choices were black Allen-heads that seem to rust if shown a picture of water and what I bough see picture. M10 x 1.25 (25mm)

SOLO LOBO 04-07-2005 10:23 AM

I have all of the specs for the adapter available in a PDF that another ADVR converted to a usable and attractive drawing... if you want it send me a PM.

**NOTE** I had to machine the caliper mounting "ears" to remove 0.0625". This moves the caliper to be approximatley centered in on the rotor... you should do your own measurements for this one!

**EDIT added 03/17/2008***

Member HPMGUY is producing the adapter that is mentioned below. Please send him a PM or email if you are interested in one... the plans are below for any "do-it-yourselfers".... Guy's work is first rate :thumb **end edit***

And machining the word "Nissin" off of the caliper is optional.... now if I could just figure out the CNC mill to add "BMW" to the caliper I'd be set...

SOLO LOBO 04-07-2005 10:24 AM

and the finished product?
 
Here is my version... (not made by HPMGuy, his is much nicer looking!)

http://home.comcast.net/~tjachp/sm_calp_wheel.jpg

SOLO LOBO 04-07-2005 10:25 AM

and one more photo...



http://home.comcast.net/~tjachp/sm_OH_view.jpg

SOLO LOBO 04-07-2005 10:27 AM

and one more...


http://home.comcast.net/~tjachp/sm_caliper_side.jpg

SOLO LOBO 04-07-2005 10:29 AM

and how does it work?
 
My test ride home was about 4 miles in the pouring rain, needless to say I dont have idea if this is a huge improvement yet. My initial thoughts are that the lever position is a bit further out then with the BMW caliper when brought completely "home" and the feel is strong an progressive. The newness of the pads and the wet weather didn't allow me to get an idea if this will make a great improvement, but the change does make a noticable difference.

I suspect that it is making a difference because I noticed a significantly greater amount of front end drive when braking....... until just now I was writing it off to changing my fork oil from 15w to 10w before doing the caliper change, but now I'm reconsidering that judgement and thinking it's from the caliper conversion.

Hope to ride in Friday and give it some more testing....

Possu 04-08-2005 01:15 AM

I considered fitting a Nissin 4-pot to my airhead GS until I measured the diameter of the Nissin caliper, worked out the surface area & found that the two large diameter GS pistons had a greater surface area than the Nissin caliper (off a GSX-R750/1100).

It could be though that Nissin pads have a greater pad area?

SOLO LOBO 04-08-2005 08:42 AM

Steve,

I'll repeat the same measurement and also check the pad area. All I can say it that the change does make a noticible difference (rode in today). I am still working through a slight ridge that the stock set-up left at the top of the rotor where the stock pads didn't touch, but that is mostly gone this morning!

I suspect that the different sized bores for the Nissin pistons makes a difference as well in the "feel" component of this change.

Let's see what my measurements say!

SL

Quote:

Originally Posted by Steve Pickford
I considered fitting a Nissin 4-pot to my airhead GS until I measured the diameter of the Nissin caliper, worked out the surface area & found that the two large diameter GS pistons had a greater surface area than the Nissin caliper (off a GSX-R750/1100).

It could be though that Nissin pads have a greater pad area?


SOLO LOBO 04-11-2005 11:28 AM

The Nissin pads are bigger..........



Quote:

Originally Posted by Possu
I considered fitting a Nissin 4-pot to my airhead GS until I measured the diameter of the Nissin caliper, worked out the surface area & found that the two large diameter GS pistons had a greater surface area than the Nissin caliper (off a GSX-R750/1100).

It could be though that Nissin pads have a greater pad area?


Wirespokes 04-11-2005 01:45 PM

Quote:

Originally Posted by SOLO LOBO
I suspect that it is making a difference because I noticed a significantly greater amount of front end drive when braking.......

I recently converted my 80G/S to a Harrison six piston and had a similar experience - more brake dive. But the increased travel at the master cylinder gave a different feel, besides it started leaking. It didn't like the conversion and decided to give up the ghost. But I came to the same conclusion that I must have increased braking as evidenced by the increased brake dive.

rockt 04-11-2005 06:02 PM

Yeah, I'd like to get more braking power from the GS. Most of the stuff I've read on Horizons Unlimited and UKGS'er suggest that going to a bigger rotor makes the most difference. Anyone figured out a cheap(er) way to do that?

SOLO LOBO 04-12-2005 01:46 PM

Thought I saw a post around here of a guy that hung a K11RS??? rotor on his airhead.... doing this Nissis mod may be enough though.



Quote:

Originally Posted by rockt
Yeah, I'd like to get more braking power from the GS. Most of the stuff I've read on Horizons Unlimited and UKGS'er suggest that going to a bigger rotor makes the most difference. Anyone figured out a cheap(er) way to do that?


GSPD750 04-12-2005 09:01 PM

Quote:

Originally Posted by SOLO LOBO
Thought I saw a post around here of a guy that hung a K11RS??? rotor on his airhead.... doing this Nissis mod may be enough though.

Hi Solo...that would be me. I'll post the pic again, and your right the caliper is from a K1100RS. Also posted is a Spiegler (german) rotor and caliper on a friends GSPD. It is an amazing brake (2 fingers will do the job)...but you get what you pay for and the whole assy including SS line is about $1000 USD. ouch.

Comparing your nissis mod to my 4pot brembo i see the similarities. We both
only gained a small amount of stopping power. It was enough to make it 'noticeable' and therefore worth the time and effort for the small amount of $ we invested. That small but still signifigant amount of stopping power just may be enough to prevent whacking something hard one day...we hope.
...good job Solo and thanks for sharing :thumbup


4pot brembo on a GSPD

http://gspd750.smugmug.com/photos/15949917-L.jpg

Speigler (german) on a GSPDhttp://gspd750.smugmug.com/photos/19563575-L.jpg

SOLO LOBO 04-14-2005 01:53 PM

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!


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