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debby
Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO
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 Posted: Thu Jun 10, 2004 7:16 am Post subject: disk brake conversion |
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I'm accumulating parts to replace the pathetic drum brake on my bike with a disk. Am thinking of using the stock rotor and caliper with maybe a Magura master cylinder.
My questions:
I noticed in my parts list that the fork slider on the non-disk side has a different p/n than the drum brake slider. Do I need to get new sliders on both sides or just the one with the caliper mounts?
Also, I've noticed that occasionally I see a bike with the disk on the left and caliper on the front. What's up with that? Did the owner or factory just put the forks on backwards or is there some reason for reversing it?
Debby |
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Scooter62
Joined: 05 Dec 2003
Posts: 166
Location: South Florida
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| Posted: Thu Jun 10, 2004 8:12 am Post subject: |
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Debby
The '75 and newer models had the disc on the left front. I've never heard a good reason for the change; maybe to counteract fork flex? It does look weird though. Also the MK III's didn't have the front hoop on the fender.
Are you sure you want a disc? Vintage Brake can turn that drum into something to equal or be better than the stock contraption.
Scooter |
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debby
Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO
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| Posted: Thu Jun 10, 2004 8:31 am Post subject: |
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vintagebrakes wants $500 and has a 12 week turnaround time. For that I can do a disk conversion then start saving up for the brembo parts. Then someday I'll have a *really* nice front brake.
And maybe I'm being pessimistic but I just don't believe that drum brake could ever be made anywhere near as good even as the stock disk. For puttering around the farm roads on Sunday morning I suppose the drum would be ok. I want a real brake though.
JMO,
Debby |
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Ron L
Joined: 27 Feb 2004
Posts: 1147
Location: Ohio
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| Posted: Thu Jun 10, 2004 9:45 am Post subject: |
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Debby,
The disc brake sliders are oval in external dimension (more meat at front and rear than on sides) while the drum sliders are round. Supposedly this is for additional strength for the "high" braking forces with the disc. While you can use the left drum brake slider with the right side disc slider, they will be visually different. |
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debby
Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO
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| Posted: Thu Jun 10, 2004 11:38 am Post subject: |
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Thanks. That's good to know. Guess I'll be looking for both sliders then. I want the bike to look right.
Debby |
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MichaelB
Joined: 14 Jan 2004
Posts: 446
Location: Yorba Linda, CA
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| Posted: Thu Jun 10, 2004 12:05 pm Post subject: |
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Yes, the 75 Mark III e-start has the brake on the left. they moved it to counter act the forces of the rear rotor on the right.
It amazes me they would put that much thought into balance / forces and build it with the wheels 1/2" out of alignment. |
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illf8ed
Joined: 30 Dec 2003
Posts: 474
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| Posted: Thu Jun 10, 2004 3:02 pm Post subject: |
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Debby,
Please make sure your drum brake is adjusted properly before you chunk it for a disc. I currently have a '75 Commando with a stock front disc brake and I can honestly say that it is no better than my old '69 Commando drum brake.
Jason |
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debby
Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO
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| Posted: Thu Jun 10, 2004 8:15 pm Post subject: |
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I'm going to look at the brake this weekend and see if there's anything I can do to improve it. Right now I don't feel safe to riding in traffic with that thing.
I don't think I've ever experienced a drum front brake that's in the same league as a disk. My dad's old water buffalo had a pretty powerful brake but it was grabby.The dual disks on the GS1000 he bought later were infinitely better. Just no comparison. So I guess I tend to have a low opinion of drum brakes.
Debby |
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nortonfan
Joined: 24 Dec 2003
Posts: 362
Location: Brisbane, Australia
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| Posted: Fri Jun 11, 2004 12:59 pm Post subject: |
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Debby,
I have purchased the Brembo Master Cylinder from CNW & am very happy with the way my stock Norton disc brake works now !!!!!
Norton owners talk about resizing the original norton master cylinder to reduce line pressure etc etc. But some have told me they notice little improvement for the cost involved.
My suggestion would be just to get the Brembo Master Cylinder and hook that up, you will be happy I am certain. No waste of money here.
You will have to get a new line from the master cylinder made up which most brake or hydraulics people can do in 15 minutes.
My front brake feels fantastic, you won't be disappointed.
Reg |
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DaveC
Joined: 22 May 2003
Posts: 22
Location: Sonoma County, Northern CA
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| Posted: Sat Jun 12, 2004 5:24 am Post subject: |
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Hi Debbie,
I have a disk on my 73 850. I kept the stock caliper and changed out the Master Cylinder to a Magura. Grimica also makes a good M/C. I then added a Stainless steel hose, replacing the stock rubber one.
I have a two finger brake on the front, have never had a concern or problem with stopping.
I do have a set of sliders at home in Las Vegas for disk brake. If you are interested in them let me know. |
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debby
Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO
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| Posted: Sat Jun 12, 2004 2:40 pm Post subject: |
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Hi Dave,
That's exactly what I'm planning to do. Thought I could use either a Magura or Brembo master cylinder. I can buy a Magura from Dennis Kirk for about half what the Norton suppliers charge for a Brembo. So that's probably what I'll do.
Was wondering what you did about the switch cluster?
Debby |
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debby
Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO
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| Posted: Tue Jun 15, 2004 10:23 am Post subject: |
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Questions, I have more questions. Always more questions. For today, I'm pondering a couple of small issues:
I'm sending my old well-used rotor out for resurfacing. Should I have it drilled also? The vintagebrakes website says don't drill the "gray iron" rotors but doesn't say why. I suppose I should ask him but was wondering what you all think about that. They certainly look cool drilled. Not sure if there's any benefit otherwise...
I'll have to get a brake line made to mate the new master cylinder with the stock caliper. Stock has a little steel pipe that connects to the caliper and the rubber hose connects to that near the top of the slider. Should I just have a new SS line made that runs all the way to the caliper or is there a good reason to use the steel pipe? (If so I'll have to buy one along with the mtg bracket. Don't have all the small bits yet).
thanx,
Debby |
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norbsa48503
Joined: 07 Apr 2004
Posts: 1034
Location: Flint, Michigan
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MichaelB
Joined: 14 Jan 2004
Posts: 446
Location: Yorba Linda, CA
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| Posted: Tue Jun 15, 2004 11:31 am Post subject: |
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The steel tube is optional. It's a matter of cosmetic appeal. The steel tube allows the hose to stay tighter in line with the slider. The one piece 'sometimes' gets a little sloppy.
My Magura does not have a mirror mount. I believe the Brembo does. If your running bar end mirrors or left only, it's no big deal. Just something else to look at.
Rockypointcycle.com has the Magura and a switch cluster. The switch cluster is made by K & S and features Hi / Lo, turn, horn, hi flash and maybe more. It is black and looks nice. It goes on the left and replaces all your switch clusters. It's just a little bigger than I would like, but not bad.
K & S makes other switches, I don't know were to get them.
Other people have gotten creative and used Japenese, BMW and even Ducati. |
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Norton Commando Forum by Corporate Pages Web hosting using phpbb
The Unapproachable Norton Commando
At the end of 1967 the Norton Commando was announced.
The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.
It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.
Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.
It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.
The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.
