touchy back brakes

Discussion in 'Sportster Models' started by Painter61, Jan 16, 2011.

  1. Painter61

    Painter61 Member

    32
    0
    0
    I have bled my back brakes and still have a problem with some times they grab good and no play on the foot brake and some time I have a lot of play and have push down towards the bottom of the pedal:bigsmiley30:
     
  2. Hoople

    Hoople Account Removed

    7,198
    0
    34
    Sounds like the master cylinder needs to be rebuilt. Fluid is passing the cups.
     
  3. NEWHD74FAN

    NEWHD74FAN Experienced Member Retired Moderators

    8,176
    98
    16
    You might take a look at inspecting and possibly servicing the rear brake caliper, cleaning the external parts initially with clear water on a large towel (brake dust is hazardous, may contain metallic/asbestos bits). Then use pipe cleaner to clean around the exposed pistons as best you can, remove the pads and spray non-chlorinated Brakleen to wash the rest off (don't contaminate the pads if you plan to reuse them)...lightly sandpaper the linings and reassemble (pushing the pistons back into the bores). The key is keep everything clean, wash hands and area often.

    http://www.hdtalking.com/brakes_tires_and_wheels/9868-replacing_rear_brake_pads_softail.html
     
  4. Safehaven

    Safehaven Active Member

    351
    16
    1

    I thought Asbestos brake pads were banned from the market since a while now. Does this still hold true for newer bikes? (OP has a `06 Sportster)
     
  5. Breeze3at

    Breeze3at Well-Known Member

    4,641
    83
    122
    Not banned (in US) but phased out by auto Manufacturers. Ford used asbestos brake pads as recently as 2003 on some models. The OP may have aftermarket pads. It is still popular in aftermarket suppliers for brakes and clutch plates
    (car). It is usually marketed as "organic" not asbestos. It may be banned in other countries.
     
    Last edited: Jan 17, 2011
  6. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

    5,275
    133
    156
    If i had the op problem of the brakes grabbing or needing a lot of pressure whilst using them i would strip the brake system from the bike an refurbish it a rebuild kit for the master cylinder and a good clean of the caliper i personally prefer to pop the pistons out of brake calipers when stripping and cleaning

    Brian
     
  7. Jack Klarich

    Jack Klarich Expert Member

    18,544
    153
    398
    Pinch off the hose to the rear brakes what does the pedal feel like now? If it still is weak best bet is rebuild or replace the master cylinder, this is a good test as you are taking the caliper out of the loop and only moving the fluid as far as the brake hose, give it a try:s
     
  8. elkhunter149

    elkhunter149 Account Removed

    134
    0
    0
    I would def. check master cylinder for pressure, make sure your front brake is working as it should, also check rear wheel alinment. If your rear wheel is not adjusted correctly it will cause your brake to spot:bigsmiley30:
     
  9. Safehaven

    Safehaven Active Member

    351
    16
    1
    Good to know! Thanks for the info.
     
  10. jerryw618

    jerryw618 Member

    60
    6
    0
    hi there did you lube the pins that the brake pads ride on ??? i forgot to do that and had the same symptoms , took brakes apart lubed the pins and groove the pads ride in and brakes work great now . its a step lots of folks dont do and causes bad brake action