How to Bleed Shimano Disc Brakes: 12-Speed Dura Ace & Ultegra

In this video, I show you how to do a brake bleed for Shimano’s new 12-speed Di2 groupset. While my bike is equipped with Dura-Ace 9270 (BR-R9270 calipers & ST-R9270 Shifters), the process is identical for Shimano Ultegra 12-speed, and is similar to the process used for Shimano’s older 11-speed models. While there are several variations of this brake bleed process that will produce similar results, the method I’m demonstrating in this video follows Shimano’s official brake bleed instructions found in their Dealer’s Manual. While I sometimes perform a simplified version of what Shimano suggests, this version is the best method of ensuring unwanted air bubbles do not get trapped in your system.

00:00 Outtake
00:30 Intro
02:32 Bike Prep
03:43 Shifter Prep
05:30 Brake Bleed
07:14 Removing Air Bubbles
10:44 Re-assembling Brake Pads

Music Credits:

Bikes by Mike Intro Scene
“5 Cents Back” by Jason Shaw on AudionautiX: https://audionautix.com/
Free to use as per Creative Commons Attribution 4.0 International License: https://creativecommons.org/licenses/...
Music unaltered

Sound Effects Credits:

Bikes by Mike First Intro Glitch
“Audio Cable Connector Noise, Glitch 3” by https://zapsplat.com
Free to use when crediting creator

Fast Forward Effect on First Clip
“390145__cuddlenucks__glitchy-tape.wav” by CuddleNucks at freesound.org
Licensed under CC0 1.0 (https://creativecommons.org/publicdom...)
Unmodified/original version

Bikes by Mike Intro Theme Song for Bouncing Wheel
“Tennis Ball Hits the Ground 01” by Sound Effects +
Standard License, Finnolia Productions Inc. House and Office, Sound Effect SFX 41802465

Bikes by Mike Intro Theme Song for Rolling Wheel
“Fishing Reel Fast” by Sound Effects +
Standard License, Finnolia Productions Inc. House and Office, Sound Effect SFX 41498102