Twin front disc conversion

[Paz2112]

In relation to 1977 350 Sport with single front disc brake on Borrani Spoked rim.

Has anyone had any experience with converting a single front disc on Borrani spoked rim to a dual front disc?

I would need a second disc and Grimeca caliper. Would anyone be able to sell me these?

[Ming]

Might be easier trying a smaller master cylinder, which should give better 'feel' to the brakes.
Otherwise, I have a spare disc and caliper, though another lister has already asked about them.

[Paz2112]

What would you need for the pair? I have read that the master cylinder is good when two discs are connected. However I am not sure if there are holes in the other side of the hub.

[norbert]

There will be no problem.
You just need a second disc and have to convert the lefthand caliper into a right one, changing the place of one bolt.
And you must cut down the diameter of the tacho-drive cover (or use one from the enduros).

There is noo need for a 19mm master cilinder, it works with the 16mm ones and even better with 13 mm.

ciao
norbert

[Paz2112]

Are the mounting holes under the steel cover plate on the right hand side?

[Mark]

Re the suggested use of a smaller bore master cylinder, how does one go about sourcing one?

[Mark]

Re the suggested use of a smaller bore master cylinder, how does one go about sourcing one?

[norbert]

Hi Mark,

I don´t know where you can find one. I ´ve found a 13 mm Grimeca for clip ons in my spare parts. We already had that issue in another post. As far as I know the one disc morinis came with a 16mm pump and the twoo disc bikes like the 500 with 19mm pumps. But a 16mm one will do.
For a less wooden brake you should try even a smaler master cilinder. My bike has a Borrani dobledisc wheel with the normal calipers, a 13mm master cilinder and stainless steel pipes. And it is a twoo finger brake.

norbert

[EVguru]

Re the suggested use of a smaller bore master cylinder, how does one go about sourcing one?

On of the benefits of a forum, is that you can search or browse through old discussions.

I have written many, many, times that the 250 twin uses a 14mm mastercylinder.

[72degrees]

Re the suggested use of a smaller bore master cylinder, how does one go about sourcing one?

On of the benefits of a forum, is that you can search or browse through old discussions.

I have written many, many, times that the 250 twin uses a 14mm mastercylinder.

Indeed. I will soon be investigating whether the 2C one for the project can be resurrected.