Fixing a stuck bicycle disc brake piston

One disc brake piston was not moving out as much as the other, causing brake caliper misalignment and disc rubbing against the caliper when aligned not to rub against the brake pads.
How it was fixed:

- Contents -
00:00 Introduction
00:34 Problem explanation
02:07 Removing the brake caliper for better filming (easier done when on the bike)
03:10 Disc brake caliper mount orientation explained
04:14 Tools needed and hand/eye protection
06:17 Cleaning the brake caliper
07:02 Pushing a piston out and cleaning it
08:34 Pushing the piston back in and the other one out
10:05 Working the pistons to get them moving nicely
12:44 De-greasing the brake caliper and the tools
13:38 Installing new brake pads
14:49 Mounting the brake caliber back on the fork
15:53 Mounting the wheel
17:29 Aligning the brake calipers - shown in the linked video below:

My video about replacing the brake pads, mounting the brake caliper and aligning it to prevent any brake scratching:
https://www.youtube.com/watch?v=KkF8K-1uAsA

- Useful links -

Indexed list of all my videos (sorted by categories, with tags, searcheable):
https://www.bikegremlin.com/youtube/

If you have any questions, please use the BikeGremlin forum - I try to respond to every comment, but YouTube sucks at notifications, especially when it comes to any follow-up questions.
https://www.bikegremlin.net/

List of all the BikeGremlin videos, sorted by categories:
https://bike.bikegremlin.com/youtube/

Eliminating disc brake rubbing:
https://bike.bikegremlin.com/7975/disc-brake-rub/

Eliminating disc brake squeal:
https://bike.bikegremlin.com/8037/disc-brake-squeal/

- Amazon affiliate links for the tools used -

Isopropyl alcohol:
https://amzn.to/3kAnPfh

ParkTool brake piston press tool:
https://amzn.to/38MkS96

Brake cleaner:
https://amzn.to/3kBVYLo

LHM Plus hydraulic mineral oil (from Amazon.de):
https://amzn.to/3lAiWDX

Support BikeGremlin using Patreon:
https://bike.bikegremlin.com/support/

id: 1019

I'm Relja, from Novi Sad, Serbia - and I mostly make videos about bicycle mechanics, cycling, and computers (those are my areas of expertise). :)