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Caliper Upgrade

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Are there any bolt-on or nearly bolt-on 4 (or six?) piston calipers that will fit an '85 Suzuki GS1150 using the standard fork legs AND discs?

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Sorry, no suggestion for any direct caliper replacements.

The feel and force of the stock EFE/GS1150 front brakes was terrible from new. From the rock hard lever and poor deceleration performance I deduct a mismatch between the master cylinder and the calipers on these bikes. It would be interesting to find out if fitting a smaller bore m/c could actually correct this and produce accepable braking performance using the stock calipers and discs. 

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A smaller bore master cyl.? I would've guessed a larger bore one. Why smaller?

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Smaller gives better power but increased lever travel. Bigger bore gives a firmer feel but reduced power. To get the best of both world's, this is why the radial front master cylinder was invented. If you want to keep the stock EFE forks, wheel and discs maybe try what arnout suggests and also different pads. Changing pads often has almost miraculous effects on braking performance.

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this is why the radial front master cylinder was invented. 

Won't make any difference - it's a cylinder with a set bore size but adjustable lever ratio. The bore dictates the pressure and the lever ratio dictates the feel!

Crap brakes won't get any better with a fancy master but they may if the master (however it is operated) is correctly sized!

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Do you have old brake lines, if they are old part of pressure just expands rubberlines instead of moves pistons.

 

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GSX1100E, no, I have braided steel lines, recently trued discs, fresh linings...and I still don't like the braking. I know it can't be my TL1000R or refitted GSXR with 6 piston calipers, but I need better stopping. That's why I'm considering getting a bracket made to adapt Brembo (at least) 4 piston calipers. 

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You can fit GSX 600F wheel and discs with 4 or 6 pot calipers on STD legs. I would use a 17mm master. I have upgraded a 88 Slabby on STD brakes with a master cylinder off a Yam XJR and got much better brakes.

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On 8/2/2018 at 11:43 AM, inazumarob said:

You can fit GSX 600F wheel and discs with 4 or 6 pot calipers on STD legs. I would use a 17mm master. I have upgraded a 88 Slabby on STD brakes with a master cylinder off a Yam XJR and got much better brakes.

Same trick in Vmax using the XJR M/C

 

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Inazumrob, do you mean that the GSX600F wheel/discs fit on an 1150 or do you mean switch the legs from a GSX600F onto the 1150 tubes. or....?

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I have used a GS500 wheel in std legs. Spindle spacers need remaking, and calipers need spacers on bolts to bring inline with GSX6000F discs. Use EFE Spindle.

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I was sure there was an upgrade to 4 pots. Seem to remeber it being on the the Old GS4 web forum a long time back. Will see if i can find.........

 

Seems the Captains link may have encompassed that modification, maybe the anwer is to fit a wheel discs and calipers as shown :).

Edited by Jonboy
Doh!!

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As it turns out, I have a local dealer who has a set of Brembo calipers from a Guzzi Norge that we're going to fit. Need to make a bracket, that's all (we hope).  

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3 hours ago, Gixer1460 said:

Nice bit of mill work there (y)

Can't take the credit for it though, from some talented chaps in Japan.

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Yeah, I was going to use them...but I found a local guy who does really good bracketry AND a dealer with takeoff 4 piston Brembos.....

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