New second hand bike, disc brake pads rubbing

Jay76
Jay76 Posts: 58
edited July 2013 in MTB workshop & tech
Hi all,

I am new to disc brakes and I noticed that both wheels are rubbing on the pads (or visa versa) Both wheels dont even complete a full circle when spun by hand before stopping. Neither wheels look buckled. They seem completely true to my eye.
The front pads have plenty of pad left but arent new. The rears are nearly worn out, prob a months worth left.

Is there an easy fix/way to recalibrate them?
The hand levers are Avid Juicy 7. I'm not sure what model the calippers are as the paint has worn off (second hand bike).
Any advice will be well received!
**2011 Cove Stiffee**

Comments

  • nicklouse
    nicklouse Posts: 50,675
    center the calipers and then push the pads hose and reset them with a few sharp pulls of the lever. if the rotors are being moved by the pads recenter the calpers again.

    but first make sure the wheels are seated in the drop outs correctly.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • thelonegroover
    thelonegroover Posts: 1,073
    Assume you mean the disks/rotors are rubbing.
    Are the disks warped or bent at all.
    Planet X Kaffenback 2
    Giant Trance X2
    Genesis High Latitude 2x10
    Planet X n2a
    Genesis Core 20
  • coulddobetter
    coulddobetter Posts: 812
    Loosen the 2 caliper bolts slightly until caliper can move.pull brake lever 2 to 3 times.domed washers mean calipers self align.still gripping lever tighten up the bolts and should be fine.
  • billybuntus
    billybuntus Posts: 38
    coulddobetter wrote:
    Loosen the 2 caliper bolts slightly until caliper can move.pull brake lever 2 to 3 times.domed washers mean calipers self align.still gripping lever tighten up the bolts and should be fine.

    Cheers for the tip. Nearly paid to get that done!
  • The Rookie
    The Rookie Posts: 27,812
    With avid calipers especially do up the bolts a little at a time, alternating between them, or the caliper can twist due to the friction under the bolt head.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • nicklouse
    nicklouse Posts: 50,675
    do not over tighten them. there is a torque setting it the manual for a reason.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Jay76
    Jay76 Posts: 58
    thanks for the advice guys I will give it a go!
    **2011 Cove Stiffee**
  • Jay76
    Jay76 Posts: 58
    Right I gave it a go last night, mainly coulddobetter's guide and they are still rubbing. I tried a few times. Anything else I can try before taking it somewhere?
    **2011 Cove Stiffee**
  • The Rookie
    The Rookie Posts: 27,812
    A little rubbing is not unusual, take it for a ride and see what happens, especially if the pads ahve worn 'funny' due to previous miss building.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • coulddobetter
    coulddobetter Posts: 812
    You say the wheels are true, what about the brake discs ?
  • Jay76
    Jay76 Posts: 58
    I tried it again and it worked, well its alot better now anyway. I get 3 or 4 revolutions before they stop.
    Checked the discs and they are true.
    Cheers
    **2011 Cove Stiffee**

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