Author Topic: Rear brake master cylinder  (Read 269 times)

Dewclaw34

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Rear brake master cylinder
« on: July 10, 2017, 12:41:12 PM »
I have an '83 FT 500 with a seized master cylinder. Tried the usual heat and penetrating oil to no avail. Any suggestions welcome

greenjeans

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Re: Rear brake master cylinder
« Reply #1 on: July 10, 2017, 02:15:46 PM »
heat.  Usually if they are frozen, the internals are pitted and generally not useable.   I'm trying to find out which master cylinders  (off another bike) might be compatible with the old one.

murdo

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Re: Rear brake master cylinder
« Reply #2 on: July 10, 2017, 03:03:24 PM »
As an experiment I drilled a 1/4" hole in the end of an old seized master cylinder so I could put a punch through and knock out the piston. That sucker was so tight that after many big hammer hits I had succeeded in swelling the alloy piston so much that it split the cylinder wall, and the piston was still stuck.  ;D
If you cannot get it out with air pressure or a grease gun then you are best to look for a new one.

Dewclaw34

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Re: Rear brake master cylinder
« Reply #3 on: July 11, 2017, 12:27:23 AM »
Thanks guys I will look for a replacement unit

Dewclaw34

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Re: Rear brake master cylinder
« Reply #4 on: August 21, 2017, 12:15:57 PM »
Fitted a 2000 CBR600 unit. Needed to swap reservoir and feed pipe to suit new dimensions. MOT passed today - happy days :)

murdo

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Re: Rear brake master cylinder
« Reply #5 on: August 21, 2017, 03:08:07 PM »
Good work.