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Soft brake when lever squeezed slow

Started by cbcanada, June 30, 2016, 05:16:39 AM

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ducpainter

#15
July 01, 2016, 01:59:41 PM
Quote from: cbcanada on July 01, 2016, 08:30:40 AM
I have not touched the bleeder yet. I figured I would check here first.
You didn't bleed the master on install?
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DarkMonster620

#16
July 01, 2016, 03:54:26 PM
Quote from: ducpainter on July 01, 2016, 01:59:41 PM
You didn't bleed the master on install?
I see where your're going . . .
Carlos
I said I was smart, never that I had my shit together
Quote from: ducatiz on March 27, 2014, 08:34:34 AMDucati is the pretty girl that can't walk in heels without stumbling. I still love her.
"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."

cbcanada

#17
July 01, 2016, 08:30:56 PM
Quote from: ducpainter on July 01, 2016, 01:59:41 PM
You didn't bleed the master on install?

No I did not Install the master myself, I had the master, the rotors and the forks changed all at the mechanics.. So I would assume they would have..

Why what would have Happened if they  did not bleed the master at the top and just bleed from down by the calipers? I does not accomplish the same?

DarkMonster620

#18
July 02, 2016, 05:21:54 AM
that might have left some air bubbles in the master . . . now, if you have a leak at the bleed nipple, best would be to replace master if nipple is tight . . .

I would recommend to replace with a new one . . .

Take a look at these:

http://motowheels.com/c-181198-parts-brake-master-cylinders.html

or

http://www.cyclebrakes.net/accossatomastercylinders.aspx

Personally I will replace my Brembo masters with Accossato . . .
Carlos
I said I was smart, never that I had my shit together
Quote from: ducatiz on March 27, 2014, 08:34:34 AMDucati is the pretty girl that can't walk in heels without stumbling. I still love her.
"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."

cbcanada

#19
July 02, 2016, 02:12:46 PM
Quote from: DarkMonster620 on July 02, 2016, 05:21:54 AM
that might have left some air bubbles in the master . . . now, if you have a leak at the bleed nipple, best would be to replace master if nipple is tight . . .

I would recommend to replace with a new one . . .

Take a look at these:

http://motowheels.com/c-181198-parts-brake-master-cylinders.html

or

http://www.cyclebrakes.net/accossatomastercylinders.aspx

Personally I will replace my Brembo masters with Accossato . . .

I tightened the nipple a slight but no more leak. Still soft lever

koko64

#20
July 02, 2016, 03:15:32 PM Last Edit: July 02, 2016, 03:20:58 PM by koko64
If there was a leak at the bleed nipple then it needs to be bled again. Master techs are busy in a shop and the junior often does the delegated finishing work (disconcerting if it's your brakes). Those bleed nipples are not real tough so they can get cracks when over tightened. Under torqued can leak, over torqued can break. Air gets trapped in the high points of the system, so just bleeding from the caliper nipples is often not enough. If it was leaking from the nipple I would take it back to the shop that did the work and ask for the head tech to check it. I hope it's just the nipple and not the seat as DP mentioned.

If you are worried about the quality of work at that shop you can try a certified auto brake specialist and ask them to check the components and thoroughly bleed the system.
2015 Scrambler 800

Howie

#21
July 02, 2016, 06:47:52 PM
In theory bleeding is easy, in practice this is often not the case, particularly with motorcycles.  The master needs to be as close to parallel to the ground as possible to avoid trapped air.  A good trick after bleeding as well as possible is to take a wire tie to hold the lever as close to the grip as possible and leave over night.  This allows trapped air to rise into the reservoir.

Quote from: koko64 on July 02, 2016, 03:15:32 PM
If there was a leak at the bleed nipple then it needs to be bled again. Master techs are busy in a shop and the junior often does the delegated finishing work (disconcerting if it's your brakes). Those bleed nipples are not real tough so they can get cracks when over tightened. Under torqued can leak, over torqued can break. Air gets trapped in the high points of the system, so just bleeding from the caliper nipples is often not enough. If it was leaking from the nipple I would take it back to the shop that did the work and ask for the head tech to check it. I hope it's just the nipple and not the seat as DP mentioned.

If you are worried about the quality of work at that shop you can try a certified auto brake specialist and ask them to check the components and thoroughly bleed the system.

I second that.  The bike should have been checked and road tested before you picked it up.

cbcanada

#22
July 06, 2016, 06:14:31 AM
I will be taking it back to get it re-bled and I suppose if that does not work, I will need to rebuild the master..

So then if the master nipple continues to leak then I need a new master? This is not something that can be corrected with a rebuild?

cbcanada

#23
July 11, 2016, 03:13:15 PM
Would this be the correct rebuild kit?

https://www.ebay.com/itm/182176993789

DarkMonster620

#24
July 11, 2016, 03:37:49 PM
Quote from: cbcanada on July 11, 2016, 03:13:15 PM
Would this be the correct rebuild kit?

https://www.ebay.com/itm/182176993789
was the nipple a "non-issue"? Did the dealership HEAD TECH go over the bike, did he himself did the bleed procedure? Remember, if bleed nipple is tight and leaking, is OVER TIGHTEN and as dp? said, NO longer good . . . Unless, you want to go, "third world" repair and teflon tape the nipple . . . just saying, that's one way we do things "south of the border"
Carlos
I said I was smart, never that I had my shit together
Quote from: ducatiz on March 27, 2014, 08:34:34 AMDucati is the pretty girl that can't walk in heels without stumbling. I still love her.
"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."

cbcanada

#25
July 12, 2016, 05:33:01 AM
Quote from: DarkMonster620 on July 11, 2016, 03:37:49 PM
was the nipple a "non-issue"? Did the dealership HEAD TECH go over the bike, did he himself did the bleed procedure? Remember, if bleed nipple is tight and leaking, is OVER TIGHTEN and as dp? said, NO longer good . . . Unless, you want to go, "third world" repair and teflon tape the nipple . . . just saying, that's one way we do things "south of the border"

I do not know the answers to your question as to who did what...

I assure you , I am not into doing things in a 3rd world manner . 😎

However I would still like to now if that is the correct rebuild kit in the previous post.

Howie

#26
July 12, 2016, 06:21:15 AM
The only way to know if that kit fits would be to cross reference it with the part# for a Gold Line kit.  Off hand, I think highly unlikely since Gold Line masters did not exist in that vintage.

DarkMonster620

#27
July 12, 2016, 06:36:58 AM
Quote from: cbcanada on July 12, 2016, 05:33:01 AM
I do not know the answers to your question as to who did what...

I assure you , I am not into doing things in a 3rd world manner . 😎

However I would still like to now if that is the correct rebuild kit in the previous post.
Sadly, Yoyodine is no longer a Brembo seller and that would have been the best guide to check . . .

That part number seems to be for Ducati PN 624.4.026.1A rather than Ducati PN 624.4.043.1A . . . IIRC, some "newer" master are NON-rebuildable . . .

Sorry if I offended you with our third world measures . . .

Now, if you can contact the vendor and ask if the part will worn on the second PN I gave you, then, is the correct one if not, check the following:

http://www.gothamcycles.com/Tools/ducati-brembo-13mm-front-brakeclutch-master-cylinder-recrem-seal-rebuild-kit.html

http://motowheels.com/i-14888423-brembo-oem-master-cylinder-rebuild-kit-13mm-piston.html

Quote from: howie on July 12, 2016, 06:21:15 AM
The only way to know if that kit fits would be to cross reference it with the part# for a Gold Line kit.  Off hand, I think highly unlikely since Gold Line masters did not exist in that vintage.
if Yoyodyne were still around selling Brembo . . . WE would know
Carlos
I said I was smart, never that I had my shit together
Quote from: ducatiz on March 27, 2014, 08:34:34 AMDucati is the pretty girl that can't walk in heels without stumbling. I still love her.
"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."

Speeddog

#28
July 12, 2016, 09:00:17 AM
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Howie

#29
July 12, 2016, 11:36:10 PM
Yeah, the loss of Yoyodyne as a Brembo distributor is traumatic.  Fred is great!
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