Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: zen cycle Newsgroups: rec.bicycles.tech Subject: Re: Disc Compatibility? Date: Thu, 6 Mar 2025 06:04:53 -0500 Organization: A noiseless patient Spider Lines: 41 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Thu, 06 Mar 2025 12:04:55 +0100 (CET) Injection-Info: dont-email.me; posting-host="146a62dca6e1170d610c8a4027a33aaf"; logging-data="3099494"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+EDXNhoKLt8D3wXhjyzZ6rYppa9ruGK2Q=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:SRbQ6uVz6EJcyB0+DeT1Coqcby8= In-Reply-To: Content-Language: en-US Bytes: 2803 > On 3/5/2025 2:17 PM, cyclintom wrote: >> On Tue Mar 4 21:55:28 2025 Roger Merriman  wrote: >>> 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. >>>> >>> 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. >