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From: Mark J cleary <mcleary08@comcast.net>
Newsgroups: rec.bicycles.tech
Subject: Re: Disc Compatibility?
Date: Tue, 4 Mar 2025 16:29:13 -0600
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On 3/4/2025 2:16 PM, cyclintom wrote:
> Andrew, I have GRX levers and Ultegra  actuators. It acts as if these are not compatible. The levers on both front and rear will not "pump" the brake pades close enough to the discs so that they actuate with almost no pull. Instead they pull almost all of the way to the bar.
> 
> The pads are hardly worn and there are no leaks from the connections.
This is a common problem if I understand it correct from you. The travel 
of the brake levers hits the bars before the pads fully engage or stop. 
The first thing to do is take of the bleed nipple in the shifter and 
pump it lightly with the wheel in lace. You likely have air in the 
system that is not fully out. Just pump a little at a time no all the 
way down to allow air to come up out of the top. Might need to do it 
twice. It can be that you need to even add bit of fluid to the brakes 
but see how this goes and report back.

-- 
Deacon Mark