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Help Suzuki GSX250F Across - Front Master Cylinder issue

Discussion in 'Suzuki 250cc In-line 4's' started by pokolbinguy, Jan 10, 2015.

  1. pokolbinguy

    pokolbinguy A bike that can't carry wine...a waste

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    WWWWAAAAAHHHHOOOOOOO !!!!

    I am finally getting somewhere and Willrcr15 and Stu were on the right track.

    I pulled the M/C apart again and found one of the M/C seals was facing the wrong way.

    At xmas time (xmas eve I think) I had a mate of mine who is a motor mechanic help me to try and work out what was wrong after I first attempted to bleed the system. We pulled the MC apart after I put a new piston/cup set in to re-inspect / clean and we found one of the seals on the new set had been damaged when we put it back in or pulled it out. We took the the best of the seals off the old piston and used it....upon putting it back in my mate asked, "did we put that seal on the correct way".....pulled it out again, turned it around on his suggestion that it was wrong and put it back together.

    I pulled the MC piston out tonight after Willrcr15 mentioning it, turned the seal around, reverse bled the system from the caliper up, fluid flowed all the way to MC all good, pulled on brake lever....PRESSURE!!!

    Now while it isn't ROCK solid it has gone hard enough that I can not roll the bike forward which is a great progress on before.

    Seeing I have had the system and fluid sitting around for a few days and the weather has been humid / rainy I will buy some new fluid and replace the current fluid. Will also replace the piston/cup set again so the "old" seal I am using is eliminated and will replace the brake line so the whole system has had an upgrade.

    So at this point I am feeling quite relieved that I am getting somewhere. While not 100% sorted I am closer than I was this morning

    Thanks for the help folks, I will keep you posted on how I get on.

    Pok
     
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  2. Phil

    Phil Senior Member Premium Member Contributing Member

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    Good to hear mate,:) your story reinforces my belief in our forum. As is the case so often, someone has been there and done that and is happy to share that experience. Hopefully you get a solid brake and are able to move on with your project :thumb_ups:
     
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  3. Joker

    Joker If you want me find Club250 on facebook. Premium Member Contributing Member

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    Do a couple of iterations of cracking (bleed valve at the caliper), pumping (at brake lever, but not until it hits the handle that's too far), bleeding (a little fluid out), close (bleed valve at caliper) until no air bubbles in the line (use a clear hose if need be). May help you iron out any little remaining bits.
     
  4. Boydie77

    Boydie77 Well-Known Member

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    I have a friend's GSXR in my garage atm I am servicing, being the local GSXR expert now (we probably own the only two in the state) and it came in with shockingly spongy brakes. The leaver came right back to the bar but pumped up to decent pressure, so I assumed just a bit of trapped air. I tried all the usual tricks but couldn't get them any better, so I drained the whole system and fitted a spare master cylinder I had. It took a lot of effort to get any pressure back up and after a lot of pumping and finally leaving it held on under pressure overnight I've only managed to get them slightly better than before. The brakes on my bike were easy to bleed and are solid as a rock, the only difference being I have race style (2 line) braided lines. I suspect the little joiner piece on the 3 line setup could be trapping the air, but the lines are getting junked and I'm fitting the same ones I use. Still in transit but I will let you know if they fix the problem.
     
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