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Old April 28th 18, 10:47 PM posted to rec.bicycles.tech
JBeattie
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Default Do EVO pads fit in KoolStop holders?

On Saturday, April 28, 2018 at 7:17:42 AM UTC-7, Joerg wrote:
On 2018-04-27 18:35, jbeattie wrote:
On Friday, April 27, 2018 at 4:18:58 PM UTC-7, Joerg wrote:
On 2018-04-27 15:11, jbeattie wrote:
On Friday, April 27, 2018 at 2:10:07 PM UTC-7, Joerg wrote:
On 2018-04-27 10:57, jbeattie wrote:


[...]



Decades of racing and riding on single and dual pivot rim brakes
in the rain and never once pussyfooted except to avoid traction
loss. I've never crashed in the rain because of brake failure
(and I've crashed many times in the rain), although I had one
close-call involving some bad cantis on STI levers, but then
again, I had an even scarier incident with mis-adjusted cable
discs. My crashes were all due to traction loss.


One of my really nasty crashes happened when the front brake cable
snapped. It was almost new. That just does not happen with
hydraulic disc brakes. I had the choice of wiping out with major
road rash or chancing it into the vegetation. In either case I'd
have been toast if there had been oncoming traffic.


A catastrophic failure can happen in any system. Breaking a new
cable is a catastrophic failure. It shouldn't happen (it's never
happened to me in maybe 300K miles of riding).



I had it happen half a dozen times. My sister had it happen at least
twice. Two of those incidences caused accidents, a 3rd almost did
(blowing through a non 4-way downhill stop sign but nobody came). These
were all good quality cables bought at reputable bike shops, not
department store merchandise.


Something is horribly wrong. I've never snapped a new brake cable or even broken an old one. Shift cable, yes -- STI levers with the hard bends can be rough on those little cables.




... You could get the
same failure with defective hydraulic tube or joint, piston, pad
holder, mounting bolt, etc. You could get a leak ...



Those are slow, you'd feel it coming. Things don't just snap.


... -- you could even blow through a pad set on a single ride.



That must be a long hard competition ride.


... A giant earthquake could wipe out your hydraulic calipers!


Yes, I suppose that could happen. Or a direct meteorite hit into the
left lever.

[...]


... I switch between disc and direct mount caliper brakes on
the weekends and find that braking is great on both.


Thanks for the hint about the Koolstop pads. They just came.
Ebay tracking is a nice "mail is here" alert. It came early
today.

They fit like a glove. I wonder why they now flare the
trailing edge inwards towards the rim. It would make the pad
want to skew. Maybe I'll grind that off.

No. It's meant to wipe the rim before the pad fully engages. It
is exactly what you want for dirt and wet weather performance.


Let's see. I could almost bet that pointy tip will be worn away
after a few hundred miles.


Depends on the 100 miles, but yes, it's not going to last forever. My
disc pads last about one-quarter the time of my rim brake pads.


Time to upgrade the disc brakes? Mine last about the same and that is
comparing a road environment for the rim pads to 90% trail riding on the
MTB. Dusty, mucky, wet and gravely trail riding. Sometimes when a stench
develops I have to pry "brake mousse" out of the front caliper. That
happens after the weeds shot up and have to I ride through them for
miles. Star thistle is particularly nasty. It tangles in the rotor
spider, then gets chopped and pureed at the caliper. Doesn't cause
performance issues but it can stink.

What wears really fast are organic pads. The kind bike shops sell you
for north of $15/pair. I like ceramic-based pads. You can't use cheap
rotors with those though, they'd eat them up. I use Shimano RT66 rotors.
They cost me $22 each, 8-inchers.


Organic are terrible, but even the metalic pads don't last that long -- not nearly as long as rim brake pads. I run 160mm rotors on the commuter and 140/160mm rotors on every thing else (the hydraulic bikes). I buy name-brand and not Chinese no-name replacements.

I have a Norco Search gravel bike with hydraulics that my son was riding today, and they get drag periodically and can be very annoying. SO TECH QUESTION: what would cause periodic dragging -- and a pinging-type drag, almost like the return springs are hitting the rotor. Then it goes away, and braking is normal -- so I know the pads are not worn out and the springs are not hitting the rotor (but I will check). Piston drag? The bike is not that old, but I could bleed it. The calipers are properly centered.

-- Jay Beattie.
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