front brake "surging"

Discussion in 'Touring Models' started by glenreeder, Mar 27, 2011.

  1. glenreeder

    glenreeder Member

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    I have a 09 SG I purchased new and now have approx 23k miles on it. I have noticed recently that when I come to a slow or "soft" stop the front brakes feel like they are surging, kind of like I am braking hard then soft, hard, etc
    The pads look good but are getting worn. It does not do this surging if I brake hard and only the front brake surges, not the back brakes.
    Any ideas?
    Thanks in advance
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Check the rotors for run out
     
  3. glider

    glider Veteran Member

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    I agree with Jack, it sounds like a warped rotor on the front.
     
  4. Jack Klarich

    Jack Klarich Expert Member

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    I do alot of brake work and reading tech info on brakes. Once rotors start to pulsate they have memorey. This will remain until they are machined( BAD) idea on a bike or (replaced). Cast iron rotors are the biggest offender. Always rescuff or replace the pads when changing rotors. The pads usually have been worn at an angle from the run out
     
  5. Bud White

    Bud White Well-Known Member Retired Moderators

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    warped rotor for sure
     
  6. rh8234

    rh8234 Banned

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    I agree - Warped rotor. If you have patience, they can sometimes be straightened. Get the wheel off the ground and set up a dial indicator to identify the high spot when you rotate the wheel. GENTLY tap on the high spot with a leather mallet and re-check. It may take several attempts (and about 6 beers), but I have has success doing this.
     
  7. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

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    Warped rotor best idea is just to replace it or it would fail inspection here for that

    Brian
     
  8. The4opps1

    The4opps1 Junior Member

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    Had the same thing on my '99 Ultra. Replaced the rotors and it eliminated the problem.
     
  9. glider

    glider Veteran Member

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    Anytime I replace rotors, I go with floating rotors which would eliminate the warping problem in the future.
     
  10. Heatwave

    Heatwave Banned

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    Floating rotors will permanently eliminate the surging you now experience.