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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Bleeding Disc's
Date: Sun, 23 Mar 2025 09:18:35 -0500
Organization: Yellow Jersey, Ltd.
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On 3/22/2025 6:06 PM, Frank Krygowski wrote:
> On 3/22/2025 5:36 PM, cyclintom wrote:
>> On Sat Mar 22 15:44:35 2025 AMuzi  wrote:
>>> On 3/22/2025 3:13 PM, cyclintom wrote:
>>>> On Fri Mar 21 13:14:24 2025 AMuzi  wrote:
>>>>>
>>>>> Detach caliper from its mount so it hangs below line.
>>>>>
>>>>> Slack handlebar clamp at the stem if needed to get the 
>>>>> lever
>>>>> port horizontal.
>>>>>
>>>>> Push fluid from bottom to top.
>>>>> Tap caliper to dislodge air bubbles while pushing the 
>>>>> fluid.
>>>>>
>>>>> You're welcome.
>>>>
>>>>
>>>>
>>>>
>>>> Thanks Andrew, but isn't that more complicated than 
>>>> simply bleeding it backwards?
>>>>
>>>> I did discover that the back actuator line wasn't all 
>>>> the way tightened which was leaking air in. I will have 
>>>> to develop the habit of always tightening connectors all 
>>>> the way when they are installed rather than going back 
>>>> after everthing is properly fitted.
>>>>
>>>> The rear derailleur is giving me trouble again. Upper 
>>>> and lower limits are set but I can't tighten the shift 
>>>> cable tight enough not to run out of adjustment in the 
>>>> cable tensioner and there's no room to use the cable 
>>>> tightener on that long arm rear derailuer. I suppose I 
>>>> will have to find my misplaced pliers to pull the cable 
>>>> since it is a left hande operation and I can't pull hard 
>>>> enough with the longnose pliers.
>>>
>>> Right.  When all else fails, read the manual.
>>> Hose coupler torque is 7nm.
>>>
>>> Unlike an auto clutch or brake system, Shimano hydraulic
>>> discs are by design purged bottom to top.
>>>
>>> Removing the caliper from its mount lets it fall to a
>>> position lower than the line and also allows you to turn it
>>> and tap it to free air pockets not near the line inlet while
>>> purging fluid.
>>
>>
>>
>>
>> Where do you find a torgue wrench thet fits an 8 mm open 
>> end wrench even if the manual was stupid enough to pretend 
>> those are normal and easily available tools?
> 
> It's about 5 ft*lbs. It's not critical. But if I wanted to 
> measure it precisely I'd probably just use a spring scale on 
> a standard wrench. Or you could use a crow's foot adapter. 
> For precision, align the adapter parallel to the applied 
> force, or else calculate the proper compensation for the 
> difference in lever arm. Torque is force * perpendicular 
> distance.
> 
> 

Practically speaking, if the coupler weeps, it's either 
assembled incorrectly, line is damaged or the coupler isn't 
tight.

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971