New Front Brake Kit

i have had this issue, mine was almost unrideable. fixed it by installing a replacement disc from Don.

i have had this issue, mine was almost unrideable. fixed it by installing a replacement disc from Don.

Right you are Marc, Don must've seen this as I got an email saying a new disc was on it's way. Just arrived today at no charge. You can't get better service than that really. Thanks Madass

just an update on my single disc brake kit and a bit of background.
When the test kits were sent to different parts of the planet for testing I had good results, it wasnt until later I had a
couple of customers with the brake lever pulsing, obviously from disc runout, because the test kits had no issues with this
I assumed all my discs were the same, but thanks to the feedback I realised that some had a couple of thou runout.something
I hadnt anticipated. The discs were not full floating, they are riveted solid, kind of defeats the purpose of having a 2 piece disc. I reriveted a few with new rivets so they would be actually floating but on riveting the riveted part had some splits which didnt look nice, over the last couple of days I have been working frantically to set up new discs, this involved new stainless rivets and a new rivetting proceedure, you can see from the pics the result, the new discs are actually proper floating discs.
Now because they are floating, no doubt there will be some wear over time, like the old 916 Ducatis etc and some British ones
that wear the inner section because they are alloy, the centre section of my discs are stainless so I certainly expect them to last longer than alloy centered floaters.
My single disc brak kits have a mastercylinder to caliper ratio of 27:1 you wont get much better than that.

Problems with your Chinese suppliers?

Don,

Is there a chance that the rivets could be replaced with a pin and clip system to make removal easier?

to make removal easier? if you mean separating the disc from the inner carrier, I dont see the reason to want to dismantle.

I thought since they are floating there may be wear on the attaching pins themselves..

Cool! A supplier that listens to customers and improves his product!

The rivets are stainless also, like any disc that wears out, a complete replacement would be the best option, like all my products parts prices are kept to a minimum as there is no middlemen jacking up the prices. I will always have stock.

Mon 20 Jan madass140 wrote; "my calipers are designed for solid discs, they have 6 acting pistons."

Mon 20 Jan madass also wrote; "....the new discs are actually proper floating discs."

Are you now supplying new calipers to suit the floating discs?

let me explain, its not necessary to have new calipers for floating discs, in fact having calipers with all pistons working and a floating disc to go with it is the best option. in theory the 6 moving pistons will travel to where the disc is, and the floating disc will move to where the pistons are. we are only talking about no more than a couple of thou sideways movement for either the pistons or the disc.
calipers for fixed discs have all pistons working EXCEPT in the early days like on a lot of Hondas where only one piston
was working and the caliper centralised itself on the disc by sliding sideways on its own pins. I'm not sure if many manufactures still use this method. they use calipers with ALL pistons working whether floating or fixed discs are used.

As far as I'm aware the sliding caliper is still used in the automotive industry. I understand the principles of the floating caliper and potential faults i.e rapid wear rivets have usually worn out way before the braking surface has worn. O.k for track use and low mileages. I prefer the semi-floating design as in the Peter Williams 'Norvil' design (I'm not talking about Les Emery's old curiosity shop here) the disc only moves to centralise, when required, under caliper pressure and does not rattle as in the full floaters.

I'm confused why you made a point of claiming the caliper had been designed for solid discs and then apparently ditch the solid disc in favour of a full floater. Disc brake combinations I'm aware of are normally floating/semi- floating disc and fixed caliper; fixed disc and sliding caliper; or fixed disc and fixed caliper.

Personally, I believe the six piston caliper is overkill for a Commando. I've the 10.5" Norvil disc, Lockheed 2 piston caliper and sleeved Mk3 master cylinder. This combination is more than adequate for a road going Commando. You're also better off keeping rotating mass on the front wheel to a minimum to reduce centrifugal force. Centrifugal force has to be overcome to get the bike to corner and this is what twists the forks. Twin discs add to the centrifugal force = more fork twist.

Six piston is state of the art. The only reason we have less and not even more pistons is the cost/benefit curve.

The longer/more rectangular the curved pad gets, the less the speed differential - at the disc - between the inside edge and the outside edge of the pad's contact points. Inside/outside speed differentials mean heat differentials, disc warpage, inside/outside pad distortion, and inside/outside wear differentials too. As the rectangle gets longer/thinner, to restore swept area, engineers balance pad pressure by increasing the number of pistons.

xbacksideslider said:

Six piston is state of the art. The only reason we have less and not even more pistons is the cost/benefit curve.

The longer/more rectangular the curved pad gets, the less the speed differential - at the disc - between the inside edge and the outside edge of the pad's contact points. Inside/outside speed differentials mean heat differentials, disc warpage, inside/outside pad distortion, and inside/outside wear differentials too. As the rectangle gets longer/thinner, to restore swept area, engineers balance pad pressure by increasing the number of pistons.

Click to expand...

Never thought about the speed/heat differential, good point, but especially on a road bike I don't think it will be that critical. No problems so far, but I understand what your saying, thanks.

Hello Don ...

Kit well received in France ! Only in four days ! Excellent !

Woh .. really very impressed by the quality of the different parts !

Serious and professional ... Don't change nothing !

:wink:

Looks good Glen.