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From: Catrike Ryder <Soloman@old.bikers.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Extensive article on Rivendell and Grant Petersen
Date: Thu, 26 Sep 2024 15:44:17 -0400
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On Thu, 26 Sep 2024 14:39:03 -0500, AMuzi <am@yellowjersey.org> wrote:

>On 9/26/2024 1:22 PM, Frank Krygowski wrote:
>> On 9/26/2024 7:06 AM, Roger Merriman wrote:
>>>
>>> Hydraulic system being in someways simpler ie only 
>>> mechanical moving parts
>>> are the pistons and the levers and sealed from grot so 
>>> will work even if
>>> completely clogged up.
>> 
>> I thought the pad retraction depended on the proper flexing 
>> of a rubber ring or seal; and I thought I came across a 
>> video detailing the need for cleaning that stuff inside the 
>> caliper to maintain proper retraction. Am I remembering 
>> wrong? ISTM that without some such mechanism, removing 
>> hydraulic pressure would still leave the pads lightly 
>> scuffing the disc.
>> 
>>> Extremely easy to live with change pads every so often, 
>>> for my uses less
>>> often than rim pads which just get eaten by the slop. 
>> 
>> Your use must be unusual. My rim brake shoes seem to last 
>> decades. And I've mentioned the Warm Showers guest whose 
>> disc pads surprised hiim by wearing out on a hilly northern 
>> Pennsylvania tour.
>> 
>> At least with rim brakes, shoe wear is easily visible.
>> 
>
>The systems are just different. Disc pads are readily 
>observed in place for wear depth and change easily without 
>disturbing any adjustments.  Damaged piston seals are 
>possible yes, but in practice uncommon. The system is 
>heavier but allows more tire/mudguard clearance AEBE. 
>Different, but neither is compelling IMHO.  Both systems 
>work well for many riders.

I can check my brake pads in bright sunlight or with a small
flashlight.

--
C'est bon
Soloman