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Front master cylinder rebuild

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  • Front master cylinder rebuild

    I bought the kit to rebuild the front master cylinder, my brake feel is really bad on the front. The dealer wants $100 labor to do it but I'm wondering if I should try it myself? I'm okay with most regular maintenance I've just never rebuilt a master cylinder before.
    Any suggestions?

  • #2
    KC you could have a caliper sticking or something other then master cylinder. I just rebuilt both my calipers and changed brake lines to stainless braided. I didnt rebuild the master cylinder cause I didnt see a need for it. If the front brakes have never been messed with since new maybe a rebuild of the entire system is in order? I would not trust someone else with my bike especially brakes but that is just me cause my time is free lol.

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    • #3
      I've been told the piston in the master cylinder wears on high mileage bikes where you get a non linear feel and a "gritchy" feel to the lever, calipers seem fine and pads wear evenly. I have flushed the fluid every 10k or so and doesn't help the
      lever feel.

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      • #4
        That does indeed look like the exact problem I'm having, thanks!

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        • #5
          yeah, the master needs a SHORT shot of spray oil under the rubber boot on the rear, WD 40 will evaporate, need a product with a residual. i use 11 oz. Heavy-Duty Corrosion Stop Protectant ,


          https://www.homedepot.com/p/Blaster-...-CSP/205048035

          its a bit pricey 4.67 , but walmart of HD have it, it seems H depot changes suppliers like underwear. cant rely on them .

          i went thru the same thang, and calipers were fine. no change after working them.

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          • #6
            I was reading your thread. You might want to check this out at:
            https://www.roadstarclinic.com/forum...amaha-roadstar

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            • #7
              I just bought new tires a few days ago so trying to get out of this pretty cheap. Thanks!

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              • #8
                Well, everybody was correct, the piston or plunger or whatever it is called had a huge crater in it. I had to buy a new set of snap ring pliers but otherwise went pretty smooth. Brakes feel 100 percent better, it's amazing! Thanks everybody for the help.

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                • #9
                  Ya changing brake fluid should be annual or so especially in humid climates

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                  • #10
                    This is not from lack of changes fluid, it has been done regularly. It's from contact of the lever.

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