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Mechanical and Technical Mechanical and technical topics, help, and discussions

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  • 1 Post By Ryanthegreat1
  • 1 Post By Syringe
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May 24th 2019, 06:27 AM   #1
 unicykle's Avatar
 
  Sep 2017
  milwaukie oregon

  gsxr600 gsxr750 gsxr1000 i like gsxrs
Excessive lever pressure

I have my 06 gsxr750 that has a R6 brake upgrade and brembo master, and the brakes work fine but it just has excessive lever pressure and it’s fine for the street but at the track turn one and turned seven it made Downshifting more difficult, my 04 Gsxr race bike with factory breaks Has a normal lever pressure and my old 07 r6 didnt have this issue. im pretty sure the 750 has just basic pads in it that are in great shape and i flushed with good fluid when i got it. It has no fade at the track and im not sure if i just need better pads or what. Any input?
May 24th 2019, 07:48 AM   #2
 
  Apr 2016
  WA

Go too large on the master cylinder?
curve addict likes this.
May 24th 2019, 09:20 AM   #3
 
  May 2016
  Milwaukie, OR

  2016 ZX-10R; 2017 Z900
You might want to check your pistons & calipers. I'd imagine that one or more of them are very dirty, and the pistons are hanging up. Had that happen with my '04 750 years ago. After cleanup, back to normal operation!

Can also be a mis-matched master cylinder, as noted.

Or pads, though that seems probably most unlikely to me.

It is also possible there's a small piece of debris somewhere in the system, maybe jammed into the banjo bolt, making the orifice smaller.
Sentinel likes this.
May 24th 2019, 10:55 AM   #4
 unicykle's Avatar
 
  Sep 2017
  milwaukie oregon

  gsxr600 gsxr750 gsxr1000 i like gsxrs
The R6 brake upgrade was already done when I got it and I do have the old master cylinder that’s under recall and I am debating on taking it down to Suzuki and getting a new master putting a factory master back on and seeing what difference that makes
May 24th 2019, 11:47 AM   #5
 
  Apr 2016
  WA

Is that the master with the plastic piston that explodes?
May 24th 2019, 12:54 PM   #6
 unicykle's Avatar
 
  Sep 2017
  milwaukie oregon

  gsxr600 gsxr750 gsxr1000 i like gsxrs
Idk i thought it was a coating that caused a fail but ?
May 24th 2019, 01:03 PM   #7
DGA
 DGA's Avatar
Moderator
 
  Jan 2016
  PDX

  An Ape and a Husky
See if you can find the bore size for each MC and the calipers. That should clue you in on if you are having a mismatch issues and which one would work better than the other.
May 24th 2019, 05:42 PM   #8
 Sentinel's Avatar
 
  Jun 2016
  Poor Tortured

  2013 Kawasaki Ninja 1000 Harlequin
sticky/stuck piston.
May 26th 2019, 07:53 AM   #9
 curve addict's Avatar
 
  Apr 2016
  Des Moines, WA

  ...1987 Yamaha FZR1000...
Quote:
Originally Posted by Ryanthegreat1
Go too large on the master cylinder?
Assuming everything else is good, a smaller bore diameter master cylinder will give you a lighter brake feel and ultimately more clamping force. The lever travel will increase some; that's the trade-off.
May 26th 2019, 10:30 AM   #10
 unicykle's Avatar
 
  Sep 2017
  milwaukie oregon

  gsxr600 gsxr750 gsxr1000 i like gsxrs
Quote:
Originally Posted by curve addict
Assuming everything else is good, a smaller bore diameter master cylinder will give you a lighter brake feel and ultimately more clamping force. The lever travel will increase some; that's the trade-off.
This makes sence as my lever is firm but doesnt travel so the brembo master is probaly to large a bore and thats where ill start checking.
May 26th 2019, 12:28 PM   #11
 curve addict's Avatar
 
  Apr 2016
  Des Moines, WA

  ...1987 Yamaha FZR1000...
Start by finding out the bore of the donor, R6 system. Check that against the bore of the Brembo.
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