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replacing front master cylinder

  • Thread starter Thread starter apcsox
  • Start date Start date
A

apcsox

Guest
anybody know where I can pick up a new front master cylinder/brake lever for my 1980 GS550? Any ones from other bikes work? need to know since my master cylinder is bad and the cover screws are completely corroded in place and I can't even bleed it
 
If it's single rotor any other Jap bike with single rotor... if it's dual rotor then any other jap bike with 2 rotors....

I have a Kawasaki Dual rotor one or an early GSXR one also a 83GS750 one that you can have cheap.. all working.

Dan :)
 
mine's a single rotor........ so it's really that easy though??? all I need is a brake level/master cylinder from any bike with a single rotor?
 
wow, that makes it so freakin easy.... to hell with cars, bikes are so much simpler
 
Stock Piston bore on the single is 14mm. That's what you're looking for in order to get the same ratio of pull to brake on the lever.

Dan :)
 
Dan, if you have two extra, I could use one for a swap meet 81 450 I just bought. It is single caliper. How much? terrylee
 
I'm glad someone asked bcuz I've been wondering the same thing. Has anyone replaced their old rectangle one with a newer cylinder shape? I like the look of it, but didn't know what all would be involved.
 
Mine are all 5/8 bore for dual rotors. That would cause less movement & harder pull on a single rotor setup or may not work at all.... You're welcome to try though...

Dan :)
 
salty_monk said:
Mine are all 5/8 bore for dual rotors. That would cause less movement & harder pull on a single rotor setup or may not work at all.... You're welcome to try though...

Dan :)
Click to expand...

It will work, and will provide a nice firm brake lever feel, but the hand pressure will be higher than stock.

Regarding those thinking about getting a different master cylinder, check out the mirror mount threads assuming you want a mirror on that side that is. Some bikes like Yamaha's use different threading, for at least some year bikes that is, and many bikes with fairings don't have a threaded boss at all.

Good luck
 
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