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  • disc rub

     giantAstax updated 7 years, 10 months ago 6 Members · 8 Posts
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  • rattyc5

    Member
    3 July 2013 at 2:49 pm

    i have avid elixir brakes. since i put new superstar pads in the front they have rubbed. the disc did have slight warping so ordered some hs1 rotors. both seem perfectly flat but still rub as if they are warped in one spot.what can i do?!i knew i would have problems with disc brakes!!

    would bleeding them help, or letting a bit of fluid out of the system? in the hope that the padswill sit slightly further from the rotors. i had read somewhere thaT superstar pads were thicker than proper avids.

    any ideas chaps. dont tell me to get rid of avids! lol brakes were perfect before i changed pads and even these pads were ok to start with.

  • Autosri

    Member
    3 July 2013 at 3:01 pm

    If its just catching in one spot give the rotors a tweak with an adjustable spanner to true them up just be careful and go very steady

  • philsmin

    Member
    5 July 2013 at 3:59 pm

    try loosening the caliper, squeezing the lever hold and re-tighten…..

  • rattyc5

    Member
    5 July 2013 at 8:59 pm

    thanks for all the replies!!! I have done every fecking thing known to man! in the end I got a new avid disc. guess what? even that fecking rubbed. took me 4 hours today to get to somewhere near what I can ride without getting pissed off! I have took lambretta engines apart and vespas but never come across anything so fecking hard to get right. even the brand new proper disc rubbed! I am 48 years old and only ever had problems with pedals before that I could not repair. I knew before I bought a bike with disc brakes that there would be problems!! I will admit that disc brakes are great but when something goes wrong they are not a quick fix. I think I want rim brakes back. I never had any problems with them and they were a lot cheaper and easier to fix!

  • theraggyone

    Member
    5 July 2013 at 9:10 pm

    Have you reset the pistons with a plastic tire lever or something?

  • Anonymous

    Member
    5 July 2013 at 9:16 pm

    Is the lever too…good god i dont know the word..like stiff or you felt there is too much pressure in it? If it is, open that bleed port a bit by the lever till maybe a half a drop of brake fluid comes out.. Tighten it back… That would release some of the pressure will pull the piston back.. I always have this problem with any new pads on my elixirs

  • rattyc5

    Member
    5 July 2013 at 9:32 pm

    Done all that and still shite. Pistons are not sticking either. At this moment in time I will be getting rid ofmountakn bike as with all this new technology they arenotas good as they were. Imo. I was getting a road bike next year as an extra anyway but am now considering getting rid of mountain bike as they are too much trouble.

  • giantAstax

    Member
    6 July 2013 at 12:36 am

    You can’t solve this issue by pulling the lever. Firstly operate the lever and move the wheel around after each pull. Check the pads are moving together. Remove the pads and the wheel. Push the pistons in all the way on both sides taking care not to damage them.

    Assuming the moved in and out together and evenly you just need to centre the calliper which you can’t do with the brake lever. Before you refit the wheel check if the disc rotor is bent or warped. If ok refit the. Wheel and making certain its properly straight in the frame with tightened skewer, slightly loosen the calliper mounting bolts.

    Check the calliper is centralised with the rotor bang in the middle. You can do this by looking straight down or by looking from the front and back at the narrowest part of the calliper close to the edge if the rotor.

    Once it’s centralised, tighten the mounting bolts lightly and re check. Now rotate the wheel and check again at varying points to cove a full rotation. If you’ve done this correctly it will be bang on. Full tighten the mount bolts and do a final check.

    Now check the pads for even wear. If its uneven, replace them. Refit the pads. No rub! Perfect alignment.

    If the pistons move unevenly you’ll need to move them outwards by slowly pulling the lever and then clean them with brake cleaner. Push the pistons in, lever out, clean and repeat until they are even.

    This is why you can’t just loosen the bolts, pull the lever and tighten. I learned this on a Cytech maintenance course.

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