F/brake master reseal

Bitza · 05-03-2024, 12:29 PM

Hi all, O.K. I use master cylinders off a 749/999 and the front brake has developed a slight air leak meaning that I have to bleed the master (very easy to do). So just wondered if Brembo produce a seal kit, and has anyone out there fitted one? I seem to remember somebody telling me that replacing master seals was very tricky.

Mr Gazza · 06-03-2024, 08:32 AM

Shame no one has had a go at replying to this. I'm sure someone must have some knowledge of this?

I have only done coffin type masters. My approach was to get a seal kit from Powerhouse https://powerhouse.uk/ or Moto Rapido.
Studying the parts in the seal kit give you an idea of how it goes together and what you can afford to destroy getting the old one out.
I had to destroy the rubber cover that conceals the innards of the coffin type and there was a retainer in there that seemed to defy any means of removing it, until I found out that I was being too scientific, the way forward was to be more brutal and hoik it out with a thin screwdriver. I had to make a very simple tool to get the retainer back in nice and square as I recall.

Radials will probably be completely different, but my approach would be the same.
Brembo kits usually come with a tiny sachet of special grease for assembly, which in the past I have carefully preserved the unused contents of, but I have just splashed out on a little pot of rubber grease.

slob · 06-03-2024, 09:38 AM

Historically Brembo/Ducati wouldn’t supply rebuild kits for Ducatis, something complicated to do with liability insurance in the supply chain, even though you could sometimes find a rebuild kit via another manufacturer. I don’t know if this is still the case. Certain approved service centres could rebuild eg. radisal race masters, Bike Torque Racing IIRC. but they had to have a certified tech who pressure tested the component afterwards.

Bitza · 13-03-2024, 08:15 AM

Just for information, no seal kits available for Brembo PR18 brake master cylinders the official line is get a new one! Tried a few potential sources as suggested above plus Mode Performance. Ho hum.

Mr Gazza · 13-03-2024, 09:13 AM

That's frustrating!!
Have you tried Ducati Paddy? He's always been super helpful to me in the past.

https://www.ducatipaddy.com/

Kato · 13-03-2024, 11:13 AM

If memory serves its the same as this KTM part

https://www.dirtbikexpress.co.uk/pro...uild-kit-front

But if not these guys will do it ffor you or supply a kit https://powerhouse.uk/

05-03-2024, 12:29 PM	#1
Bitza Bronze Member Join Date: Jul 2006 Location: Poole Bike: M900ie Posts: 470	F/brake master reseal Hi all, O.K. I use master cylinders off a 749/999 and the front brake has developed a slight air leak meaning that I have to bleed the master (very easy to do). So just wondered if Brembo produce a seal kit, and has anyone out there fitted one? I seem to remember somebody telling me that replacing master seals was very tricky. __________________ Bitza Last edited by Bitza; 06-03-2024 at 07:37 AM..

06-03-2024, 08:32 AM	#2
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,806	Shame no one has had a go at replying to this. I'm sure someone must have some knowledge of this? I have only done coffin type masters. My approach was to get a seal kit from Powerhouse https://powerhouse.uk/ or Moto Rapido. Studying the parts in the seal kit give you an idea of how it goes together and what you can afford to destroy getting the old one out. I had to destroy the rubber cover that conceals the innards of the coffin type and there was a retainer in there that seemed to defy any means of removing it, until I found out that I was being too scientific, the way forward was to be more brutal and hoik it out with a thin screwdriver. I had to make a very simple tool to get the retainer back in nice and square as I recall. Radials will probably be completely different, but my approach would be the same. Brembo kits usually come with a tiny sachet of special grease for assembly, which in the past I have carefully preserved the unused contents of, but I have just splashed out on a little pot of rubber grease. __________________

06-03-2024, 09:38 AM	#3
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,710	Historically Brembo/Ducati wouldn’t supply rebuild kits for Ducatis, something complicated to do with liability insurance in the supply chain, even though you could sometimes find a rebuild kit via another manufacturer. I don’t know if this is still the case. Certain approved service centres could rebuild eg. radisal race masters, Bike Torque Racing IIRC. but they had to have a certified tech who pressure tested the component afterwards. Last edited by slob; 06-03-2024 at 11:42 AM..

13-03-2024, 08:15 AM	#4
Bitza Bronze Member Join Date: Jul 2006 Location: Poole Bike: M900ie Posts: 470	Just for information, no seal kits available for Brembo PR18 brake master cylinders the official line is get a new one! Tried a few potential sources as suggested above plus Mode Performance. Ho hum. __________________ Bitza

13-03-2024, 09:13 AM	#5
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,806	That's frustrating!! Have you tried Ducati Paddy? He's always been super helpful to me in the past. https://www.ducatipaddy.com/ __________________

13-03-2024, 11:13 AM	#6
Kato Dismantled Join Date: Feb 2006 Location: East Molesey Bike: Multiple Monsters Posts: 2,222	If memory serves its the same as this KTM part https://www.dirtbikexpress.co.uk/pro...uild-kit-front But if not these guys will do it ffor you or supply a kit https://powerhouse.uk/ __________________ "Political correctness is just intellectual colonialism and psychological fascism for the creation of thought crime"