How to Bleed Shimano Hydraulic Disc Brakes


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Items Required To Bleed Shimano Disc Brakes

  • Syringe
  • Shimano Hydraulic Mineral Oil
  • Isopropyl Alcohol
  • Shimano Bleed Funnel
  • 2.5 mm Allen Wrench
  • 3 mm Allen Wrench or Pliers, depending on brake style.
  • 4 mm Allen Wrench
  • 5 mm Allen Wrench
  • 7 mm Box Wrench
  • Bleed Block

Follow These Steps To Bleed Your Shimano Brakes

  1. Remove the rear wheel.

  2. Remove the brake pads. Your Shimano brake pads will be secured by a cotter pin or bolt, depending on your brake type. Use pliers for a cotter pin, or the 3 mm allen wrench for a bolt in order to remove the pads.

  3. Install the Bleed Block using the cotter pin or bolt.

  4. Adjust the brake lever so it is level. This helps the air bubbles rise to the top.

  5. Remove the bleed fitting screw with the 2.5 mm allen wrench.

  6. Thread in the Shimano brake bleed funnel and leave the plunger in.

  7. Fill the syringe with Shimano hydraulic mineral oil and place the syringe on the bleed nipple.

  8. Open the bleed fitting using the 7 mm box wrench.

  9. Remove the plunger from the Shimano bleed funnel and begin pushing fluid through the system.

  10. Close off the bleed fitting and remove the syringe. Add a bit of suction to the syringe to avoid splashing any hydraulic fluid on your Shimano brakes.

  11. Remove remaining air bubbles by alternating beteween full pulls and light flicks on the brake lever.

  12. Replace the plunger and remove the funnel.

  13. Replace the bleed fitting screws (or caps) at both the lever and caliper sides.

  14. Clean brake lever and caliper with isopropyl alcohol using a rag.

  15. Remove the Shimano brake bleed block and re-install brake pads with the cotter pin or bolt.

  16. Re-install rear wheel.

  17. Repeat the process for the front wheel if needed.


Voila! Your Shimano brakes are now bled and ready to shred!

Disclaimer: This Shimano brake bleed guide is for informational purposes only. It is not intended as a "Do It Yourself" guide to bike adjustment or maintenance, nor as a substitute for professional advice and service. Always have your bike serviced and inspected by a certified bike technician.

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