Re: Extensive article on Rivendell and Grant Petersen

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.
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Andrew Muzi
am@yellowjersey.org
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