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 Post subject: Master cylinder rebuild
PostPosted: Mon Jan 29, 2018 2:46 pm 
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On the street

Joined: Sat Apr 11, 2015 6:52 am
Posts: 13
Country: England
Bikes owned: GT550 ( 1975 )
Hi Guys ,
I decided to powder coat my front brake caliper and master cylinder over the winter . ( GT550 m )

I ordered what I thought was the correct parts , however when they arrived they did'nt match what I had taken out !!

I was then advised that some kind person had replaced my master cylinder with a GT250 unit .
can someone please advise if I have the parts in the correct order to be fitted as I cannot find any info on line .

First in is spring open end , black rubber clips into small end of spring , then small thins brass disc , followed by ali piston c/w rubber seal , then all held in place by a circlip then fit rubber boot ???

Thank you

( damned photos won't upload ! :(


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PostPosted: Tue Jan 30, 2018 4:39 am 
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Expert racer

Joined: Mon Dec 01, 2008 2:52 am
Posts: 1152
Location: Manchester, UK
Have a look here at the exploded diagram of the master cylinder:

http://www.oldjapanesebikes.com/mraxl_G ... /index.php

_________________
1976 GT380 - wounded by me, and sold on
2006 SV650S. It's got cams, and valves, and stuff


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PostPosted: Tue Jan 30, 2018 11:59 am 
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Road race school

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 810
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
would that mean you have an incorrectly sized master cylinder? I know many GT550s had twin discs, while the GT250s had single disc.
I am not sure of the bore sizes, but it would make sense that on a bike with two calipers you would have a different size master cylinder than a bike with one caliper. You might wish to check this with one of the more "model specific" experts on here.


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PostPosted: Tue Jan 30, 2018 2:06 pm 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2151
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
GT550s never had twin discs as standard. People used to fit them by using a 750 left fork leg, caliper and m/c until the later models with 'twin disc' fork legs.
GT750 master cylinders had a 'D' underneath, for 'dual' and was a larger diameter piston.


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PostPosted: Fri Feb 02, 2018 3:04 pm 
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Road race school

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 810
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
Alan H wrote:
GT550s never had twin discs as standard. People used to fit them by using a 750 left fork leg, caliper and m/c until the later models with 'twin disc' fork legs.
GT750 master cylinders had a 'D' underneath, for 'dual' and was a larger diameter piston.

I stand corrected. Thanks for setting me straight.


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