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SZ-R Disc Brake Issue

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  • #1

    SZ-R Disc Brake Issue

    Guys,

    Recently after a service I changed the brake fluid from DOT3 to DOT4.
    Since that time I'm facing braking issues, sometimes while riding it looses it's grip and disc brake becomes fully playable like clutch.
    I'm frustrated with this any ideas what could be wrong??
    Last edited by kgthenerd; 01-19-2013, 06:19 PM.
    Proud Owner of Yamaha SZ-R
    Why petrol prices gets hiked during midnight? Any thoughts? (0_o)

    Remember never drive a bike without helmet.
    https://www.facebook.com/kgthenerd
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  • #2
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    • #3
      Originally posted by kgthenerd View Post
      Guys,

      Recently after a service I changed the brake fluid from DOT3 to DOT4.
      Since that time I'm facing braking issues, sometimes while riding it looses it's grip and disc brake becomes fully playable like clutch.
      I'm frustrated with this any ideas what could be wrong??
      Did you try bleeding and filling the brake fluid back so as to make sure there are no air bubbles?
      What is the level of brake fluid in master cylinder. Make sure the cylinders are all air tight with proper sealing.
      There are no short-cuts to any place worth going. So ride safe when you are treading uncharted roads.

      Comment

      • #4
        Originally posted by kgthenerd View Post
        Guys,

        Recently after a service I changed the brake fluid from DOT3 to DOT4.
        Since that time I'm facing braking issues, sometimes while riding it looses it's grip and disc brake becomes fully playable like clutch.
        I'm frustrated with this any ideas what could be wrong??
        Air lock. The bleeding process was not carries out properly. Get the brake bled again.
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        • #5
          Originally posted by prajnyan View Post
          Did you try bleeding and filling the brake fluid back so as to make sure there are no air bubbles?
          What is the level of brake fluid in master cylinder. Make sure the cylinders are all air tight with proper sealing.
          Originally posted by Divya Sharan View Post
          Air lock. The bleeding process was not carries out properly. Get the brake bled again.
          I'll do the bleeding tomorrow, the entire brake fluid looks like thin dark black liquid, I think when they changed the oil from DOT3 to DOT4 they did bleeded the line.

          Thanks to Drifty for this awesome DIY guide
          xBhp.com : The Global Indian Biking Community
          http://www.xbhp.com/talkies/do-yourself/21050-brake-fluid-replacing-brake-bleeding-rtr180.html



          Update:
          I followed the exact procedure showed in the DIY the issue is still there
          I've filled the canister with DOT4 oil bleeded the line twice.
          The braking efficiency remains same
          Last edited by kgthenerd; 01-21-2013, 09:22 PM. Reason: Update after DIY
          Proud Owner of Yamaha SZ-R
          Why petrol prices gets hiked during midnight? Any thoughts? (0_o)

          Remember never drive a bike without helmet.
          https://www.facebook.com/kgthenerd

          Comment

          • #6
            Hmm. Black liquid? How was it when you filled it, its color and texture, has it changed? Mine looks transparent golden color from when I replaced it 5 months back. I use Dot3 Motul. Also I don't see the need for a DOT4 liquid for SZR. Our brakes are more than good enough on the basic DOT3 itself. There couldn't be any other explanations if its not the air in the fluid. it could be the seal kit in brake cylinder, or the pistons that press the pads together etc. I suspect seal is broken and this is resulting in that loss of pressure to pump the liquid.
            Last edited by prajnyan; 01-22-2013, 11:23 AM.
            There are no short-cuts to any place worth going. So ride safe when you are treading uncharted roads.

            Comment

            • #7
              Originally posted by prajnyan View Post
              Hmm. Black liquid? How was it when you filled it, its color and texture, has it changed? Mine looks transparent golden color from when I replaced it 5 months back. I use Dot3 Motul. Also I don't see the need for a DOT4 liquid for SZR. Our brakes are more than good enough on the basic DOT3 itself. There couldn't be any other explanations if its not the air in the fluid. it could be the seal kit in brake cylinder, or the pistons that press the pads together etc. I suspect seal is broken and this is resulting in that loss of pressure to pump the liquid.
              Last time when my mechanic filled DOT4 oil it looked looked dark black same thing yesterday when i opened the canister for bleeding it was same.
              And now I'm getting poor braking from my front disc

              Click image for larger version Name: IMG_20130122_095255.jpg Views: 1 Size: 68.6 KB ID: 1837538

              prajnyan this how it works while riding?
              Some of my friends are suggesting that brake hose has gone kaput still I've no idea about that, meanwhile I'm planning to switch to Steel Braided lines.

              Btw Is it possible to fix KTM Duke Steel Braided lines with this bike??
              Last edited by kgthenerd; 01-22-2013, 08:24 PM. Reason: Typo's
              Proud Owner of Yamaha SZ-R
              Why petrol prices gets hiked during midnight? Any thoughts? (0_o)

              Remember never drive a bike without helmet.
              https://www.facebook.com/kgthenerd

              Comment

              • #8
                1. Steel Braided lines are expensive and if the original lines were not faulty, the new ones will be of no help as fault lies elsewhere.
                I doubt it is the line, since any damage to the rubber lines means when you pump the brakes the brake oil should leak out and any kind of leak should be visible.
                2. How much does the duke's lines cost? Any braided line, even those from BMW can be used if you can find the connecting joints are actually able to fit the master cylinder and one at brake pads perfectly such that there is no leak. If the diameter of the lines change, amout of brake fluid to be stored in master cylinder will need to vary, otherwise the brakes wont engage. The problem will be same as what you are facing. I am sure the improvement from changing to steel braided lines wont be more than 10%                 in brake system effectiveness and that can take a toll on the brakepad and the rotor disc, it can also cause strain on the other components.

                I suggest you leave this worry to SVC mechanic. Ask them to overhaul the front brake system and check for any fault. If they say that its because of the DOT4 and you must go back to DOT3. I wont agree. Only difference between them is the boiling point of the liquid. DOT4 can tolerate more heat. Even if DOT4 degrades it is better than fresh DOT3.
                Last edited by prajnyan; 01-23-2013, 12:42 AM.
                There are no short-cuts to any place worth going. So ride safe when you are treading uncharted roads.

                Comment

                • #9
                  Re: SZ-R Disc Brake Issue

                  Originally posted by kgthenerd View Post
                  Last time when my mechanic filled DOT4 oil it looked looked dark black same thing yesterday when i opened the canister for bleeding it was same.
                  And now I'm getting poor braking from my front disc

                  [ATTACH=CONFIG]91727[/ATTACH]

                  prajnyan this how it works while riding?
                  Some of my friends are suggesting that brake hose has gone kaput still I've no idea about that, meanwhile I'm planning to switch to Steel Braided lines.

                  Btw Is it possible to fix KTM Duke Steel Braided lines with this bike??
                  Dot 4 brake fluid is transparent.



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                  • #10
                    Hi,

                    most likely the mechanic has not done the process of re-filling/bleeding the brake line correctly. It is though remote, but highly unlikely that the brake lines have gone bust. I suggest you should visit an SVC rather than a local mechanic. I would recommend DOT 4 over DOT 3 especially for the lot who loves to do a lot of long distance rides as DOT 4 has got better heat tolerance compared to DOT 3. Though DOT 3 is more than enough for city usage.

                    If you are keen on going for steel braided lines then i would suggest that you should check with HEL performance braking distributors in India if they manufacture steel braided lines for Yamaha SZ/R. I would personally recommend not to experiment with brakes using brake lines from some other bike especially for something so crucial as this.

                    Cheers,
                    A quote by a toilet, " use me well, keep me clean, i would never tell anybody whatever i have seen.." :P

                    Comment

                    • #11
                      Originally posted by shv18 View Post
                      Hi,

                      most likely the mechanic has not done the process of re-filling/bleeding the brake line correctly. It is though remote, but highly unlikely that the brake lines have gone bust. I suggest you should visit an SVC rather than a local mechanic. I would recommend DOT 4 over DOT 3 especially for the lot who loves to do a lot of long distance rides as DOT 4 has got better heat tolerance compared to DOT 3. Though DOT 3 is more than enough for city usage.

                      If you are keen on going for steel braided lines then i would suggest that you should check with HEL performance braking distributors in India if they manufacture steel braided lines for Yamaha SZ/R. I would personally recommend not to experiment with brakes using brake lines from some other bike especially for something so crucial as this.

                      Cheers,
                      shiv the SVC mechanic are no good in my area i went yesterday noon, after a five minute rough check he said we need to replace entire brake kit (excluding rotor) and it will cost some $$$.
                      No wonder i expected this from them. When my bike had power loss in mid range they said it's a added feature from Yamaha to avoid excessive speeding

                      Duke 200 has same BYEBRE canister at top so my guess is it should be able to fit snugly into this. I've asked PlanetDSG about HEL line let's see what they say.
                      If no one helps i'll head over to Joel at Bangalore (for BB kit)

                      I'll check this out once again today let's see what another SVC say about this.

                      UPDATE:-
                      It was a issue with cylinder kit replaced it and the issue resolved.
                      Rs 190 for the kit + Rs100 problem solved.
                      Last edited by kgthenerd; 01-23-2013, 03:37 PM. Reason: Update
                      Proud Owner of Yamaha SZ-R
                      Why petrol prices gets hiked during midnight? Any thoughts? (0_o)

                      Remember never drive a bike without helmet.
                      https://www.facebook.com/kgthenerd

                      Comment

                      • #12
                        Good to know your problem was rectified.
                        There are no short-cuts to any place worth going. So ride safe when you are treading uncharted roads.

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