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From: zen cycle <funkmasterxx@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Disc Compatibility?
Date: Thu, 6 Mar 2025 06:04:53 -0500
Organization: A noiseless patient Spider
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> On 3/5/2025 2:17 PM, cyclintom wrote:
>> On Tue Mar 4 21:55:28 2025 Roger Merriman  wrote:
>>> cyclintom <cyclintom@yahoo.com> 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.
>>>>
>>> Should be, uses same pads/hose fitting kit and so on, and appears to be
>>> same calipers broadly from Tiagra to Dura Ace, though Cues is I believe
>>> doing its own thing! Aka less performance more simple design.
>>
>>
>>
>>
>> What I was trying to discover was if the 10 speed GRX levers didn't 
>> have the capacity of the 11 speed Ultegra actuators. That occurred to 
>> me in a dream. 

Which is where tommy gets most of his silly ideas - dents popping out of 
top tubes, for example

> But since they are compatible it must be air in the 
>> system. The thing that bothers me is that all of my previous disk 
>> bikes had hard front and back brakes. This setup has the same pull on 
>> front and back and the front is a straight shot up and bled without a 
>> problem.
> 
> Because the rear caliper line entry is at an unusual angle. The front 
> points straight up.
> 
> Need to remove the rear caliper form the frame so it can be at the 
> lowest point in the system, line pointing up.  Rap the caliper with a 
> tool handle while purging the fluid. It has air in the nooks and 
> crannies of the caliper.
>