Dura Ace Di2 Hydraulic brakes (R9170)

[JayUK]

Hi all,

Can anyone with this setup let me know where the free stroke screw is located on the levers? For the life of me I cant find it

Also, I have a lot of travel on the brake lever (it virtually pulls back to the handlebar). I have bled the system, it does this on both front and back. Is there a way to adjust this? (I don't think there is). This is not a reach adjustment issue.

Thanks,

J.

[ms6073]

Checkout page 166 of the Shimano DM-R9150 Dealer Manual and you will find the image below:

[boots2000]

Interesting- I just shortened the reach on mine, free stroke felt pretty spot on.
If you have too much level travel, you might need more fluid in the system?

[wheelbuilder]

Interesting- I just shortened the reach on mine, free stroke felt pretty spot on.
If you have too much level travel, you might need more fluid in the system?

This. With the pads installed and the red pad spacer between them, attach your syringe to the caliper bleed port only. Open the valve and force some fluid into the caliper. While you are still applying pressure to syringe, close the valve. This will reduce pad travel.

[ms6073]

(it virtually pulls back to the handlebar). I have bled the system

Based on my experience with two sets of the ST-R9170 levers, 9150 calipers, and BH-90 hydraulic hose, if lever travel is excessive, then the system is not adequately bled. When I bled ours with the yellow brake block installed, I bled them until lever travel was very minimal.

Which rotors? Brake calipers? Are you using Shimano BH-90 hydraulic hose? If you are using 3rd party rotors, I think many of the super light rotor options come in at only 1.8mm thick versus 2 mm for the RT-99 IceTech or the Dura Ace SM-RT900 rotors which might account for the added lever travel. As for hydraulic hose, the SM-BH59 is the old wider bore hose that was spec'd for the non-series ST-R785 levers and SM-BH90 is the newer narrow bore hose that should be used for the 9150/9170 levers.

[JayUK]

Hi all,

After a ride I re-bled the system and it seems better now.

Thanks for replying

J.

ps - BH90 hose, R9170 callipers and rotors