Left hand rear brake control - Page 6 - Ducati.ms - The Ultimate Ducati Forum
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post #51 of 72 (permalink) Old May 11th, 2019, 11:25 pm Thread Starter
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Well, a bit of a setback.

Installed everything, used the motive pressure bleeder from the lever reservoir and was able to get solid pressure in the system.

Reinstalled the caliper and tested for leaks.

My welding job was not good enough. Small leak from the fitting joint on the brembo rear master.

Next step is to dissemble that master, clean it up well, sand down the joint and re braze it.

Can I just apply more material from the brazing rod over the existing joint? Do I have to pull out the fitting and start from scratch?
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post #52 of 72 (permalink) Old May 12th, 2019, 6:51 am Thread Starter
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Here is a picture of the reweld.

I sanded it down and noticed there were some cracks in material. I guess that was the source of the leak.

Heated it up until existing material became molten, then added more brazing material until I had a really nice looking fillet.

Here it is.

Will reinstall and test again.
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post #53 of 72 (permalink) Old May 12th, 2019, 7:27 am
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You can always reheat and reflow the brazing material. Usually when it doesnt adhere to the metal is was not clean enough but what you did was perfect. Found the source, sanded and re flow'd the material.
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post #54 of 72 (permalink) Old May 12th, 2019, 8:27 am Thread Starter
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You can always reheat and reflow the brazing material. Usually when it doesnt adhere to the metal is was not clean enough but what you did was perfect. Found the source, sanded and re flow'd the material.
Tested it and it still leaks. Almost as if it is porous because I cannot see any defect.

This time I will heat, remove the fitting and as much old material as practical, then reflow.

Patience ....
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post #55 of 72 (permalink) Old May 12th, 2019, 1:44 pm Thread Starter
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No Joy.

I cannot seem to weld the fitting adequately. Leaks through the weld.

The fitting and master are pretty much just an educational tool at this point.

I will buy another master and fitting and find a pro to do the welding.

Back to the mechanical LHRB control for now.
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post #56 of 72 (permalink) Old May 23rd, 2019, 7:09 am Thread Starter
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An amazing forum member (anonymous until he wishes to be revealed , pics of his craftsmanship below) has welded a new fitting on to my master, so the project is still alive. Leak tests are pending.

In the meantime, I have gone back to stock master and mechanical left hand rear brake.

I am trying to figure out if I have air, water, or just insufficiently high temp boiling point DOT 4 in the system.

At the beginning of the ride, my left hand rear brake is sort of mushy feeling. After an hour of hard and heavy use, the lever becomes very firm.

As the fluid heats up is it causing water to boil, brand new Castrol DOT 4 to boil, or is that air heating up and expanding?

To rule out air and water, I could bleed it again with fresh fluid of the same type.

To rule out the inadequacy of the fluid, I could then bleed with better quality brew.

I may do both.
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Last edited by Pard; May 23rd, 2019 at 9:24 am.
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post #57 of 72 (permalink) Old May 23rd, 2019, 8:21 am Thread Starter
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Buddy of mine is fitting this thumb brake on his Panigale. Very eager to hear how this well engineered system works.

IMA SPECIAL PARTS Volpiano Italy TBS - THUMB BRAKE SYSTEM


https://www.ebay.com/itm/IMA-motorcy...gAAOSwT9lZemSO

https://www.youtube.com/watch?time_c...&v=CJy7Gz58T9o
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Last edited by Pard; May 23rd, 2019 at 9:05 am.
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post #58 of 72 (permalink) Old May 23rd, 2019, 9:06 am
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I will be shipping it back to you today. I thought I had a way to pressure test it but the beringer master cylinder I have laying around apparently needs to be re built. I am bbn very confident with the welds and fitment of the piece I made.
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post #59 of 72 (permalink) Old May 23rd, 2019, 9:18 am Thread Starter
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Originally Posted by araitim View Post
I will be shipping it back to you today. I thought I had a way to pressure test it but the beringer master cylinder I have laying around apparently needs to be re built. I am bbn very confident with the welds and fitment of the piece I made.


AWESOME!
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post #60 of 72 (permalink) Old May 27th, 2019, 9:43 am Thread Starter
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The Red Baron has arrived - Page 4

Check out this system. Elegant but expensive.

Last edited by Pard; May 27th, 2019 at 10:34 am.
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