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FAQ - Epic Bleed Solutions

How do I reset my brake calliper pistons?

How do I reset my brake calliper pistons?

Resetting the pistons in your brake calliper is one of those tasks you will need to perform when fitting new brake pads or before bleeding the brake system.

Below is a picture of a Shimano Deore M596 brake calliper before the pistons were reset and after to show you the difference.

shimano brake calliper pistons reset position

There are two ways to reset the position of your calliper pistons. The easiest way is with the brake pads in situ. Simply push a flat blade screwdriver in between the brake pads and twist. This will separate the brake pads and, in turn, push back the pistons to the reset position.

separating avid brake calliper pistons with screwdriver between brake pads

If you've already removed your brake pads, don't go through the trouble of putting them back in, reach for a plastic tyre lever and use it to push the pistons back into their housings.

Note: Never use sharp or metal objects to reset the position of the pistons as you may cause damage.

separating shimano brake calliper pistons with plastic tyre lever

Now you've reset the position of the calliper pistons you can go ahead and insert your new brake pads or bleed block.

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iRobot, Content Curator

Sacked from his previous job for operating a bike repair business during his lunch hour, iRobot now manages the FAQ section at Epic Bleed Solutions.