Master Cylinder Sleeve Kits

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Stephen Hill said:
Done right, a sleeve is a non-issue. In my last mod I used a stainless sleeve, slight interference fit, loctited in place, and turned a bronze piston. It will never corrode again. There is a retro kit that relies on an o-ring to make a seal between the sleeve and mc body, and apparently these can leak between the two, if not installed correctly.

Stephen Hill
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good to hear , however I've had lock ups with modded master cylinders. Please don't let my thoughts stop anybody from modifying their brake systems.
 
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Stephen Hill said:
Thank you for clarifying gentlemen. But probably to the main point of the last post, can we agree that this is the smaller bore (13mm vs 5/8") which results in a more powerful brake than the stock bore?


Stephen Hill
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Stephen,
Night and day difference between the 5/8 bore to the two finger braking with the 13MM. At least in my experience. But my M/C are the kits with a bunch of adjustable parts to get the stroke right as per RGM instructions. Andover has made the piston assembly the same as the original 5/8 style but with the smaller bore and seals.
I found the old PDF of the July newsletter and it definitely states that Andover is now making it in 13MM bore
Quoted from the newsletter is as follows:
"Master Cylinder Update
New Commando front brake master cylinders were introduced in early 2016. The first batch sold out quickly and more are ‘in progress’ now. This UK-made product offers a useful performance improvement achieved by reducing the piston bore to 13mm.
The master cylinder is supplied as a ‘short’ kit, i.e. less the brake lever, pivot bolt, reservoir diaphragm and cap or as a ‘full’ kit including all these parts. The body has a threaded boss to accept an original style mirror.
All Commando versions are available.
These products are available now at introductory pricing:
06.1939/13, Front M/Cylinder, inc. internals, pre850Mk3, ‘Short Kit’ £169.50 + vat (July 2016 delivery)
06.5741/13, Front M/Cylinder, inc. internals, 850Mk3, ‘Short Kit’ £169.50 + vat (July 2016 delivery)
06.4871/13, Front M/Cylinder, inc. internals, cap & lever, pre850Mk3, ‘Full Kit’ £199.50 + vat (Aug. 2016 del.)
06.5742/13, Front M/Cylinder, inc. internals, cap & lever, 850Mk3, ‘Full Kit’ £209.50 + vat (Sept. 2016 delivery)"
https://andover-norton.co.uk/en/shop-de ... -internals
Hope that helps.
Cheers,
Thomas
 
I think I will be ordering this

06.4871/13, Front M/Cylinder, inc. internals, cap & lever, pre850Mk3, ‘Full Kit’ £199.50 + vat (Aug. 2016 del.)
 
Stephen Hill said:
Original bore is 5/8". The link you provided identifies it as a 13mm bore, so yes, it would be sleeved.
Click to expand...
Andover has them available manufactured with 13mm bore so that they don't need to be resleeved.
 

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Norton74 said:
I know this thread is over a year old but I just saw it and wanted to offer some personal experience.

I have the Old Britts 13mm re-sleeve on my 72 and 74 Commandos and they work very well. Much better feel, less effort, and better stopping. I can't quantify it with physics, I can only say that they stop MUCH better , and the workmanship, like everything Fred Eaton sells, is first class, including the powder coating and mechanical locking of the sleeve. I also spoke with the designer/manufacturer who does the work for Fred and his design is first class.

I took a different approach on my 73. I used the kit that Frank Cornwall at Clubman Racing sells that uses a new Grimeca 13mm master cylinder and an ingenious, nicely machined adaptor that lets you use the original Lucas switches and mirror. Most people can't tell the difference - only a Norton-o-phile who looked closely would know, and they all compliment its good looks and traditional appearance. And the performance is equal to, and in fact a bit better due to somewhat improved leverage in the design of the Grimeca. But it's not original, so that's the trade off.

On another note, I did have a related issue, but not with the master cylinder. I rebuilt the caliper with new o rings and stainless steel pistons, but the o rings were about .003" too wide (in cross section), for a total of .006" and it was enough to hold the pistons too tightly. As a result the pistons couldn't slide in the o ring and the elasticity of the o ring kept retracting the pistons into the caliper bore making it impossible to get a good, solid lever (too much fluid needed to make up the space between the piston/pad/rotor before good contact was made).

After numerous attempts to bleed, using every trick in the book, I made a tool out of bent wire that slipped into the inspection slot and confirmed the piston was retracting about 1/16" when I released the lever, so I rebuilt the caliper again and it bled and worked perfectly. I mention this as it was a vexing problem and it could save someone a day or two of frustration when they could have been riding!
Click to expand...

Also had Old Britts resleeve mine or send it wherever they send it. I like the look of the OEM mastercylinder so did not want to go the modern Brembo route. Huge improvement in braking performance and still going strong after 10 years or so.
 
CanukNortonNut said:
L.A.B. said:
Stephen Hill said:
Original bore is 5/8". The link you provided identifies it as a 13mm bore, so yes, it would be sleeved.
Click to expand...

I believe that AN master cylinder is manufactured with the 13mm bore size rather than being 'sleeved' down from 5/8".
Click to expand...

I think you are right L.A.B. There was a andover norton July newsletter stating that. They made a bunch.
Cheers
Thomas
Click to expand...
Did they cast up some 13mm MKIII's also?
 
jimbo said:
good to hear , however I've had lock ups with modded master cylinders. Please don't let my thoughts stop anybody from modifying their brake systems.
Click to expand...

Happened to me several times but only when the bike was parked in direct sunlight on a hot day so at least it wasn't a safety issue....if the front brake was applied the MC would seize and hold pressure, would have to open the bleed nipple on the caliper and douse the MC with cold water to get it to release. Posted my experience here awhile back and learned that several others had similar experiences. Rather than fool with the sleeved MC I opted to install "Madass'" MC kit, $150 IIRC and have been very happy with it.

(the adjustable lever in the photo was installed by me, didn't work well and I went back to the standard lever supplied with the kit)

Master Cylinder Sleeve Kits
 
I dont think the new 1/2" Andover ones are sleeved, they are made 1/2" bore
Don
 
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