Re: Bleeding Disc's

Frank Krygowski <frkrygow@sbcglobal.net> wrote:

On 3/20/2025 4:44 PM, Mark J cleary wrote:

On 3/20/2025 2:46 PM, cyclintom wrote:

I can't say what's going on. The fact that you had to bleed the rear
brakes backwards but I cured the front brakes which you would think
wouldn't be a problem since it is all vertical hoses was amazing.
Bleeding that brake from top to bottom releases a lot of air bubbles
after which the disk levers were hard and with about a half way pull
to lock.
 
The levers with the bleeding cap off appeared top be full of liquid so
the levers were full and it couldn't be air trapped somewhere in the
levers.
 
 
but installing a funnel and filling it half way and using the syring
on the bottom pulled a great deal of air out of the system.
 
So while the Shimano instructions and most of the videos showed bottom
to top, bleeding trom top to bottom as one video, made by a woman
mechanic seems to be the only way to get the brake properly bled.

 
I have done it both ways and all seem to work about the same. However
getting in a hurry and not letting things settle is a problem. This
youtube video I watched is great and this works great.
 
https://www.youtube.com/watch?v=brLF56banjs

 
SO much more finicky than dealing with cable actuated rim brakes!
 

This is a Tom thing! Cable disks have niche applications, much like
hydraulic rim brakes, both of which aren’t obsolete but are technological
dead ends, with the same products being sold.

Cable disks as they aren’t a sealed system, get muck into the callipers,
which absolutely will do a number on the calliper, my Gravel bike as new
had cable disks, used a few different callipers before I upgraded to
hydraulic.

They require much more maintenance, aka adjusting as the pads wear down,
aren’t as powerful as hydraulics and realistically are rather the worse of
both worlds.

Assuming the bike has the clearance for 32ish then rim brakes arguably are
easier to live with as long as it’s a road bike, rim pads have a remarkably
short lifespan on wet mucky rides! Let alone lack of power and so on.

Roger Merriman