Brake problem
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Thread: Brake problem

  1. #1
    Team Tercel Rally Array Rev's Avatar
    Join Date
    Nov 2002
    Nanaimo, BC
    89 CBR 600F

    Brake problem

    I just replaced my rear pads on my 1989 CBR 600, while the pads were out i depressed the brake pedal to see how the pistons moved and it appears the one moves much faster/farther than the other, i also noticed this in pad wear on the old pads... now im thinking this means i should rebuild the caliper... any opinions?

    1989 CBR 600...

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  3. #2
    this is my...boomstick! Array CrotchetyRocket's Avatar
    Join Date
    Aug 2002
    click, click
    Yup, a stuck, or sticking, piston wouldn't be a big surprise after all these years.


  4. #3
    New chain...Soo smooth... Array Black Sunshine's Avatar
    Join Date
    Apr 2004
    At bare minimum I would flush the brake fluid thoroughly, and try to get them cleaned/rebuilt when you get the time/money.

    Tune-up Tip: If you can't fix it with a hammer, then you must have an electrical problem.

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  6. #4
    Moderator Array TeeTee's Avatar
    Join Date
    Feb 2002
    Out to pasture in the 'Wack
    04 Kawi Z1000,
    One will always move easier than the other. Try holding back the easy one and if you need more than a few ounces of push before the other side moves than a good cleaning or a rebuild wouldn't hurt.

    Try extending the pistons to a point where you can see clean sidewalls and clean the gunk off the exposed parts that need it. Just don't go so far that they pop out of the seals. A blast or two of brake cleaner won't hurt either. A thin wipe of brake fuild on the newly cleaned sidewalls of the pistons will hep lube them for the pushback. A good flush and pump them in and out a few times and you may just avoid the need for a strip and rebuild. I freed up a couple of the stickier pistons in both my race bike and the Green Meanie this spring using this technique.

    And if you blow it and pop out a piston then the system obviously needed rebuilding anyway. Just be sure the pads are safely out of the way before things get messy.
    A backyard mechanic without a service manual is just like a hooker without a lamp pole.... they are both in the dark.

  7. #5
    It's a flat black 600 now Array
    Join Date
    Jul 2004
    Powell River
    '91 Yamaha FZR600
    Like said above it sounds like a stuck caliper piston (since the caliper is stationary). You could likely do it yourself for really cheap, less than $30 I bet. I would think that the chrome would be still good on the pistons so all you need is some seals and some brake fluid. Take it all apart and clean up all the pieces in hot water and dish soap take a good look at the chrome surface that the seal rides on and if it's pitted in any way it should be changed. Make sure all the water is off and coat the seals and pistons with brake fluid and assemble and of course bleed. At no time use any type of oil base cleaners or grease!!! Very important!!! There are special assembly lubes for brake systems but thay are rarely used and not normally necessary.

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