Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Thread Tools Search this Thread
Old 05-16-12, 08:36 AM   #1
Thread Starter
Join Date: Jul 2009
Posts: 77
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hydraulic disc brake piston reset

well I made a poor mistake and squeezed the brake while the wheel was off so now the pistons are to far in the middle. I tried using a 10mm box end wrench to push them back but they don't go back very easily. It is fairly close now, but the pads are still rubbing on the rotor just barely. How can i get it to stop rubbing/get the pistons back farther?
bicyclebikes is offline   Reply With Quote
Old 05-16-12, 09:51 AM   #2
Senior Member
mechBgon's Avatar
Join Date: Jul 2002
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thoroughly degrease a flat-tipped screwdriver with rubbing alcohol so it doesn't contaminate the brake-pad material, then insert it between the pads and rock it gently to push the pistons back. Now reinstall the wheel and pump the brake lever so the master cylinder can readjust the pads to the rotor.

If you still have rubbing:

1. confirm your rotor bolts or lockring are snug
2. check whether your rotor is significantly warped (sight through the pad-to-rotor gap while spinning the wheel and watch for rotor warp)
3. center the caliper on the rotor, which often can be done by loosening up the caliper bolts about 1/2 turn, then snugging them down while holding the brake lever to clamp the rotor between the pads.

Some brakes also have adjustments for free-stroke and pad contact, but you didn't mention what kind of brakes you have.
mechBgon is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 12:50 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    get answers from real people!
Click to start entering your question.