Front Disk Brake Rebuild

Classic Norton Commando Motorcycles.

Front Disk Brake Rebuild

Postby kernel65 » Mon Oct 07, 2013 5:00 pm

Does anybody have the part numbers for a complete front ('72 model) disk brake rebuild from the master cylinder to caliper? Included in the part numbers a decent steel braided brake line. All I've seen have been some rubber o-ring / washer type kits. There's got to be more than that to it...

Thanks.

Scott
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Re: Front Disk Brake Rebuild

Postby rvich » Mon Oct 07, 2013 5:44 pm

I would go through these two groups on the Old Britts web site:

http://www.oldbritts.com/nor_comm_72_15.html

http://www.oldbritts.com/nor_comm_72_19.html

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Re: Front Disk Brake Rebuild

Postby dennisgb » Mon Oct 07, 2013 5:47 pm

Usually best to tear the components down to determine what is needed. Parts are available but rebuild kits only contain the consumables (rubber, springs, etc) because that is what is needed. Pistons usually only need to be replaced if rusted or damaged.

Caliper pistons are available from a number of sources:

http://www.steadfastcycles.com/cart/ind ... 73cbaf2f4b

Master cylinder piston:

http://www.ebay.com/itm/Norton-Commando ... 0494478919

You might want to think about a sleeve kit for the master cylinder if you don't have one in there...improves braking power.

Here's a site with all sorts of Norton brake parts and upgrades:

http://www.clubmanracing.com/Pages/nortonbrakes.htm
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Re: Front Disk Brake Rebuild

Postby hobot » Mon Oct 07, 2013 6:00 pm

Piston can be badly rusted and still work perfect as long as the oil ring seals seal. Piston rust can pit the bore so then must resleeve to next size down ratio. Piston rust can allow leaks out the lever plunger area yet work great on brake pressure and not leak in use just sitting in heat. If ya do keep original - red hot nail poke out the tiny rubber restrictor valve hole, will not help the leverage but sure allows that grip leverage to act on the caliper more distinctly for easier tire noise braking. If caliper plucks rusted best to get SS versions and never worry with that hassle again. None of the resleeve kits have any restriction which I now feel is a large part of what we like after resleeve. A brake job w/o much rust is just the 2 seals at top and 2 at bottom as spring don't wear out unless rusted away.
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Re: Front Disk Brake Rebuild

Postby nortriubuell » Mon Oct 07, 2013 8:25 pm

kernel65 wrote:Does anybody have the part numbers for a complete front ('72 model) disk brake rebuild from the master cylinder to caliper? Included in the part numbers a decent steel braided brake line. All I've seen have been some rubber o-ring / washer type kits. There's got to be more than that to it...

Thanks.

Scott


Hey Scott, check out the previous post below :

new-norton-master-cylinder-questions-t16607.html

It has some links I posted for some excellent plastic coated stainless brake hose, in any length you want. Plus all the fittings and adapters and what not. Hope this helps ... Cheers.
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Re: Front Disk Brake Rebuild

Postby Torontonian » Mon Oct 07, 2013 8:48 pm

Where is this "restrictor" rubber thingy that we should be poking a red hot nail to ?
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Re: Front Disk Brake Rebuild

Postby rpatton » Mon Oct 07, 2013 11:08 pm

kernel65 wrote:Does anybody have the part numbers for a complete front ('72 model) disk brake rebuild from the master cylinder to caliper? Included in the part numbers a decent steel braided brake line. All I've seen have been some rubber o-ring / washer type kits. There's got to be more than that to it...
Thanks.
Scott


Scott As far as the caliper goes, the description pretty much says it all. The only other thing left to do is replace are the pistons with stainless. Check the condition of the bore. The pistons could have done a number on it.
06-4243 Caliper Rebuild Kit (2 06-1930 & 1 06-2187)

When you get a braided brake line you need to get one that's the right length for your bars.
15-200004 Brakehose, Front, 26" Long, Braided Steel
15-200005 Brakehose, Front, 24" Long, Braided Steel
15-200006 Brakehose, Front, 22" Long, Braided Steel
15-200007 Brakehose, Front, 18" Long, Braided Steel
15-200009 Brakehose, Front, 21" Long, Braided Steel

The master cylinder is also just a matter of replacing all the rubber parts and checking the bore of the cylinder. I can't remember which part is supposed to get perforated with a poker but the retainer and the trap valve are necessary for the spring to work or else it would be a serious problem. What's the "restrictor"?
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Re: Front Disk Brake Rebuild

Postby hobot » Tue Oct 08, 2013 12:29 am

Oh yes must keep all the parts of Lockheed m/c installed for the stack length for correct spring action. That's why ya poke a hole instead of just tossing it out like other master cylinders replacing the Lockheed. The restriction 'valve' to poke out - at least 1/16"+ is in the end of the black rubber item on LH of photo. After feeling the distinctly more abrupt action i believe restriction was Norton worried about riders used to drum brake grabbing lever too much and crashing. I've fitted a too long hose by leaving out the stand pipe so lucked out.

item 11, pn 061944 Master Cylinder Trap Valve $7.43
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Re: Front Disk Brake Rebuild

Postby kernel65 » Tue Oct 08, 2013 2:52 am

Perfect. That was the info I was looking for. I guess I will start with a tear down and go from there. I'm sure I will run into some snags so I'll be back.

Thanks all.
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Re: Front Disk Brake Rebuild

Postby B+Bogus » Tue Oct 08, 2013 3:41 am

kernel65 wrote:Perfect. That was the info I was looking for. I guess I will start with a tear down and go from there. I'm sure I will run into some snags so I'll be back.

Thanks all.


While you're at it you may want to consider a re-sleeve job to reduce the M/Cyl bore - makes an incredible difference to the brake.
I use the RGM Motors ones, but there are others out there.
The only downside is the brake pads don't last as long :oops:
Cheers,

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Re: Front Disk Brake Rebuild

Postby concours » Tue Oct 08, 2013 5:15 am

JFWIW, I opted to NOT re-sleeve, and try the disc first. Fresh seals (and of course judicious cleaning/polishing of the bore) in the master/caliper, Ferodo pads, 12,000 miles later, I am satisfied with the front brake, panic stops and all. The tire will squeal when commanded by my right hand. Certainly not a two-finger modern type brake, but absolutely adequate and safe in modern traffic. Big paws (and at least SOME of my youthful strength :shock:) help to make it work. YMMV
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Re: Front Disk Brake Rebuild

Postby dennisgb » Tue Oct 08, 2013 5:44 pm

Torontonian wrote:Where is this "restrictor" rubber thingy that we should be poking a red hot nail to ?


That's what she said :D
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Re: Front Disk Brake Rebuild

Postby kernel65 » Tue Oct 08, 2013 5:47 pm

Any trick to getting #11 and #12 out of the reservoir?
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Re: Front Disk Brake Rebuild

Postby staticmoves » Tue Oct 08, 2013 5:50 pm

Contact mike at Walridge Motors in Lucan Ontario for master cylinder exchange.

I think it's $200 CAD plus your core an the new one is sleeved to 13mm an epoxy coated.
They also have the braided lines, just let them know wich bars you have.
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Re: Front Disk Brake Rebuild

Postby Torontonian » Tue Oct 08, 2013 5:55 pm

Good girls know about party -hat restrictors. No glove no love.
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