Re: RE: Re: RE: Re: RE: Re: RE: Re: Disc's without power

On 5/2/2025 12:45 PM, cyclintom wrote:

On Fri May 2 11:57:24 2025 AMuzi  wrote:

On 5/2/2025 11:33 AM, cyclintom wrote:

On Fri May 2 10:45:37 2025 AMuzi  wrote:

On 5/2/2025 10:03 AM, cyclintom wrote:

On Thu May 1 17:34:52 2025 AMuzi  wrote:

On 5/1/2025 5:21 PM, cyclintom wrote:

On Thu May 1 15:20:05 2025 Roger Merriman  wrote:

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I?m slightly surprised he admitted he was taking it to the shop! I
personally go for the how often am I likely to use said tools, can I
reasonably do it? My ability to fix stuff is rather limited now as the
brain doesn?t work the way it used to.
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And the bike shop is a 5 min walk away and being a shop that does repairs
as their focus, it?s hardly expensive.

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Do you own a disc brake bike? The full set of tools for working on them from Park Tool is pretty damn expensive.
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https://www.amazon.com/Park-Tool-Brake-Mount-Facing/dp/B014LC7546/ref=asc_df_B014LC7546?tag=bngsmtphsnus-20&linkCode=df0&hvadid=79852149837928&hvnetw=s&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583451676423827&psc=1
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That is only half the tools that they sell for disc brakes.
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So you think that because I have ONE flat mount disc brake bike that I am going to spend over $400 for surfacing tools?
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And my rim brake DeRosa Aluminum main triangle and the Disc Brake DeRosa Idol full carbon are exactly the same weight. So why would I even want to have a dic brake bike except as a test to see if flat surface mount disc bike is any better than the older offset disc brakes? The Merak has carbon wheels and stops a LOT better than the disc. The extra weight of the discs and the constant maintenance show me that they are only for pros and you might notice that manufacturers suddenly are building rim brake bikes again. Do you suppose that there may be a reason for that?
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Also, carbon fiber bikes were used BECAUSE they are light and not because they ride well. Tom Ritchey was interviewed and said that even 1 1/8th steering tubes screws up the comfort of a bike.
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Apparently I filed to be a tester for the Beta software so MY software is different than the stop software with some sort of error in the Average Speed calculation. I know the Beta software is correct because I timed it on a watch.
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I am a real EE unlike Flunky so stop pretending that Flunky saying something means anything at all

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Brake mount surface milling to ensure that it is in the
correct plane is normal to a framebuilding operation but
highly unusual in a service shop. In real life, it just is
not a problem.  Could it happen? Probably yes. Have I ever
seen such? No.
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90% of disc brake issues are air in the system. The rest are
mostly worn or contaminated pads

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Well, I never saw it before either. But I got that bike sent to me via FedEx for $400 complete. Don't you suppose that the former owner had a similar problem with it and was willing to sell it for a price that would not end up in a return?
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I will say this - those flat mounts are NOT machined. Both front and back are slightly rounded. And WHY would Park Tool make tools to machine those surfaces flat?

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Doesn't sound right to me:
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https://derosa.it/model/idol/
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This is not Ugo DeRosa, torch in hand, sorta eyeballing  a
brake bridge height or a cable stop position.
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Modern ends _with incorporated brake mounts_ are a standard
uniform industrial commodity.  In any material.  Frame
makers can't screw it up because they don't make that part
themselves.
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https://www.framebuilding.com/NEWPARTSPAGES/NEWIMAGES/lr27.jpg
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https://www.bikefabsupply.com/dropouts/p/ogq-flatmount-intergrated-dropouts-flanged-12x15mm-thru-axle

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Andrew aside from those mounts being nothing like those on the DeRosa. you can see that they are castings and not machined flat. The operation is as you said originally. The frame is very carefully built because the through axles perfectly center the wheels which is almost a zero tolerance construction considering the  wheels are set into the frame and fork. They forgot to machine the actuator mounts and since it is both front and rear someone simply put it in the finished line rather than the needs-to-be-machined line. Surely you've made dumb mistakes like that before.
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I could be wrong since misalihnment is just my guess so I will have to see what Robinson comes up with. But no other disc brake bike I've had has acted like this, but no others had flat mounts.

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How about $5 even money that 'caliper mount surfaces not
perpendicular' is not the problem here. I'll even trust you
to report what the tech finds.

    Since this is nothing more than a guess on my part I would only be willing to bet if you hsd an alternate answer other that "not that".

I had another answer, yesterday.
Symptoms from your 28 April original post:
"no power" is most probably air in the system.
"noisy" is more probably contaminated brake pads than anything else.
Those are the two most common bicycle disc brake problems as I noted. You cited both symptoms.
Had you said, "I cannot properly align and center the caliper to the disc."  (which you did not write) I would have suspected poor technique first and defective frame prep as a very distant, highly unlikely, second possibility.
--
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971