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.