LF Harris T140 Master Cylinder for Commando MK3

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The latest master cylinders from LF Harris and some US supliers are not the same as those they supplied a couple of years back. The the new version does not fit as the piston is different. Not had time to look at the latest version in detail, but it needs to be screwed further so the set screw can sit on the flat. The problem is that as you screw it in to align the set screw you are operating the piston. It would be possible to assemble the brake on the bike with the master reservoir removed and monitor the piston to ensure it does not travel past a hole as the body is screwed in. You would need to do the same when adjusting the push rod.
I have tried both and didn't like the pedal travel and switched back to standard bore.
' but it needs to be screwed further so the set screw can sit on the flat.'
But doesn't this have to occur for the reservoir inlet to be vertical too??
 
' but it needs to be screwed further so the set screw can sit on the flat.'
But doesn't this have to occur for the reservoir inlet to be vertical too??
Yes, If you use the AP instructions with the latest master cylinder assy, then the shortcoming becomes apparent.
 
The latest master cylinders from LF Harris and some US supliers are not the same as those they supplied a couple of years back. The the new version does not fit as the piston is different.

Not had time to look at the latest version in detail, but it needs to be screwed further so the set screw can sit on the flat.


How can it "not fit" then? The fact that the 13mm master cylinder needs adjusting differently has been discussed.

If you use the AP instructions with the latest master cylinder assy, then the shortcoming becomes apparent.

Is that extremely important piece of information and how to adjust it correctly included with the 13mm master cylinders sold by AN?
 
@Madnorton
I asked for clarification about various comments you made in a previous thread regarding master cylinders but there was no reply (and no photos).

 
Yes, If you use the AP instructions with the latest master cylinder assy, then the shortcoming becomes apparent.
AP instructions? Not sure how old mine was/is, but it came with AN printed sheet from Hungerford. As I will be doing a caliper overhaul sometime, I hope to find the optimum position (as far as it's possible within a complete turn) by 'back filling' the Master cylinder sans reservoir from the caliper to find exactly when the inlet port is obscured, then turn them until the flat (and consequently the reservoir) are at their correct orientation....
(NB: I'm currently doing the job in my head, 'hands on' may throw up anomalies :-) )
 
@Madnorton
I asked for clarification about various comments you made in a previous thread regarding master cylinders but there was no reply (and no photos).

I could strip both side by side, but just by looking at the piston under the circlip there is visual difference. Sadly this Covid has been keeping me more busy than normal in more than one way. The sooner it goes I should have more time not have to share access to a warm workshop to strip them.
 
Yes, If you use the AP instructions with the latest master cylinder assy, then the shortcoming becomes apparent.
AP instructions? Not sure how old mine was/is, but it came with AN printed sheet from Hungerford.

If the fitting instructions sent with the 13mm master cylinders aren't accurate then, as it is to do with brakes I would have thought it should be a matter of some urgency to provide the correct instructions.
 
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