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  1. #1
    CB750 New Member fg1972's Avatar
    Join Date
    May 2019

    Brake master cylinder, rebuild or replace?

    Hello again,
    My front was a bit blocked up with crud but managed to get it free with compressed air up the line and working enough to allow me to remove all the pistons from the calipers. Now that Iíve fully dismantled the master cylinder, I could easily clean it up in a sand blaster then buy a new rebuild kit and new reservoir as mine is a translucent white plastic one that has deteriorated somewhat. The cost of the rebuild kit and reservoir is about triple the cost of buying a new aftermarket complete front brake unit. What are peopleís thoughts on those aftermarket units from China? My rear also doesnít work so Iíll be probably looking at a similar challenge when I get to that.

  2. #2
    CB750 Enthusiast NicksHonda's Avatar
    Join Date
    Apr 2018
    Sacramento, CA
    I wouldn't sand blast it. I imagine you won't get ALL the sand out, but maybe.
    I went with an aftermarket master cylinder. So far so good. I know, it's not original, but mine isn't going to be in any concourse, nor will it be a collector as it isn't now.
    Havin' Fun in Sacramento!

    2006 BMW R1200RT
    2002 Honda CBR954RR
    1979 Honda CB750L

  3. #3
    CB750 Addict pidjones's Avatar
    Join Date
    Sep 2018
    East TN
    I've used Chinabay MCs, and found that they must be disassembled, cleaned thoroughly, and reassembled properly with brake fluid lubing the assembly. Don't be surprised at the stuff that comes out when you clean.
    "Love 'em all.... Let GOD sort 'em out!"

  4. #4
    CB750 Member mitchi's Avatar
    Join Date
    Feb 2014
    My thoughts zactly................!!!

    I'm intending on ordering after market MC in a bit, cause both of my fours front brakes are locking up.

    I've rebuilt the calipers, but no the MCs.
    "If it ain't raining, I'm riding"

  5. #5
    CB750 Member mroussetos's Avatar
    Join Date
    May 2018
    Toronto, Ontario
    Was it hard to rebuild the calipers? What tools do i need? Thanks
    Save lives. Shoulder check!

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