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Apr 23rd 2018, 08:11 AM   #1
 cgt1229's Avatar
 
  Feb 2016
  Bellingham

  Suzuki
Front brake master cylinder

Can anyone explain the parameters of fitting a non stock master cylinder or one from a different bike?
Could one put a master cylinder from a Yamaha, Suzuki, Kawasaki, Ducati, Aprillia, KTM, or BMW on a bike with like rotor size or engine displacement?

Used stock ones can be had for $70ish.

The one on there, is a mush fest anodized cheap number. I never felt steel braided brake lines feel so squishy. I bled the heck out of them, almost a whole bottle, and ran the lines directly to each caliper from the master cylinder
vs. the loop from one caliper to the other.

Front end is a 03 Gixxer 1k.
Apr 23rd 2018, 08:24 AM   #2
 Boatdriver's Avatar
 
  Jan 2016
  Washington

  16' Tuono Factory, 15' Kawi Concours
I put a Brembo RCS 19 0n my 08' GSX R1000 without issues
Apr 23rd 2018, 09:44 AM   #3
 curve addict's Avatar
 
  Apr 2016
  Des Moines, WA

  ...1987 Yamaha FZR1000...
If the replacement master cylinder has the same bore dimension as the original, it will work just fine. Smaller master cylinder bore = stronger braking but more lever travel to engage. Also there is a greater chance of wheel lockup when braking. Larger master cylinder bore = less lever travel but more finger effort required; harder to lock the brakes.

If you want to get more technical about it; if the bore, the distance between the new lever's pivot point, and the point where the push rod is attached is identical to that of the original, then the brake feel will remain the same as with the original unit.

Edit: The bore dimension is often cast into the body of the master cylinder.

There ya go

Edited by curve addict on Apr 23rd 2018 at 09:57 AM Reason: clarification
Apr 23rd 2018, 10:35 AM   #4
 Tripledij's Avatar
 
  Jan 2016
  Custer WA

  Aprilia Tuono 1100
Here is the suzuki fork matrix with some useful info

Master cylinder dia is second from bottom



Apr 23rd 2018, 06:51 PM   #5
 Sentinel's Avatar
 
  Jun 2016
  Poor Tortured

  2015 Kawasaki Concours 14 - The Origame Sea-Dragon
erm...didn't he specifically say he does NOT want it to end up feeling the same as the one he nows considers squishy?

Apr 24th 2018, 09:20 AM   #6
 Nathan's Avatar
 
  Jan 2016
  space needle

the previous owner of my Kaw zrx1200 modded the front brake w an RC51 master cylinder, steel braided lines, zx10 radial calipers, & Braketech floater rotors. I love it - one finger braking, definitely an upgrade... No brembo$ nec...
Apr 24th 2018, 09:21 AM   #7
 curve addict's Avatar
 
  Apr 2016
  Des Moines, WA

  ...1987 Yamaha FZR1000...
^^ Yes, the OP did. However, everyone needs a reference point to start from. If I had known the diameter of the stock unit's bore at the time of my reply, I'd have provided that. I was not as clear in my wording as I might have been, so there is that; ya got me. The information provided may yet prove helpful to others reading the thread.

Also, from the OP's description, the existing unit may be aftermarket. Tripledig was kind enough to supply some information on the stock unit, so an appropriate unit can be located.

Here's another thought; the existing unit may be working just fine but there is still a bubble of air in the lines causing problems. We readers cant' know that.
Apr 24th 2018, 03:24 PM   #8
 cgt1229's Avatar
 
  Feb 2016
  Bellingham

  Suzuki
Hey thanks for the help. Boatdrivers MC was supposedly on my bike, but pulled off before sale. According to Tripledig chart the bore is 14mm, not sure what the cheapo unit is, but supposedly fits the application. Will try one more crack at MC banjo, for a bubble. I'm sure a stock one would work fine, just thought I could broaden my search if others readily worked.
Apr 24th 2018, 08:15 PM   #9
 Sentinel's Avatar
 
  Jun 2016
  Poor Tortured

  2015 Kawasaki Concours 14 - The Origame Sea-Dragon
Quote:
Originally Posted by Nathan
the previous owner of my Kaw zrx1200 modded the ....
damn i miss my zrx. a lady in a corolla killed it one morning.

damn fine bikes.
Apr 25th 2018, 10:16 PM   #10
 cgt1229's Avatar
 
  Feb 2016
  Bellingham

  Suzuki
There was an air bubble at the Master cylinder duel banjo...Thanks curve addict.
Actually feels better than before with about 1.5" of space between bar and lever,
instead of 2/3-3/4". Might be able deal with that. The adjustable lever is set at 6-farthest out.
Apr 29th 2018, 09:12 AM   #11
 curve addict's Avatar
 
  Apr 2016
  Des Moines, WA

  ...1987 Yamaha FZR1000...
I'm glad you found the problem, and that it was a cheap fix.
Apr 29th 2018, 01:38 PM   #12
 Rusty Nail's Avatar
 
  Jan 2016
  Sandy

  2013 Spyder
Yay! Fixed is good. Reminds me of an old car I had. Mushy brakes no matter how much I bled them finaly occured to me that the breeders were on the bottom of the calipers and thus not able to do there jobs. The previous owner had swapped the calipers from one side to the other at some point.
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