Update on brembo caliphers vs twin cam , question brembo brakes

[barny7655]

Are all brembo master cylinders, for twin discs, cant see any of the old style ID marks like 9/16 and 11/16 ,are there any ID marks ?Since you are updated on a few features of the brembo system thought id point this at your self, or any others that are up to date on them , and plus FSG your on the same time, as my self , i have two master cylinders , 1 chrome  and the other  using as a doner for parts, have measured the piston around 5/8 cheers Barny

[FSG]

Are all brembo master cylinders, for twin discs, YES , I thought there may come a time when HD would decide to put HD Brembos on the other models as well providing us with a single caliper MC but I doubt that will ever happen. 

cant see any of the old style ID marks like 9/16 and 11/16 ,are there any ID marks ?  NO 

have measured the piston around 5/8  Interesting thanks  

Brembo do not make repair kits for the HD Brembo Caliper or MC, NOR for that matter do HD want them to, BUT the Teflon Coated Pistons (32mm), seals and wipers are a standard Brembo size and used on various model KTM's and rebuild parts are available from KTM.  As with using anything non standard, you need to do your homework.  The single HD Brembo Caliper on the Fatty using the Stock 9/16" MC and DOT 5 is working a treat.

[WVULTRA]

HD Dude claims:

Rebuild kits for the 08+ Brembo calipers are now availible through the aftermarket, anybody need them let me know.....

http://www.cvoharley.com/smf/index.php?topic=51580.0

[FSG]

WV I don't go there, can you find out more ?

[WVULTRA]

Will do my best.

[barny7655]

 Thanks for the replies every one ,Measured the bore of the brembo master cylinder they are 5/8, not what i thought as 11/16 ,not to say the old  11/16 master wont work  with the brembo caliphers,bit odd as to the change ,havent gone into the 4 piston bores on each caliper to see the difference there,one wants to have the right pressure, as well as volumme, to expand the pistons,will see when it all goes together as to the handle height etc ,they are all new so should bleed up okay ,  with dot 4 of course, cheers Barny

[Admiral Akbar]

Now take that 5/8 master and put it one an earlier bike with pre-Brembo calipers and surprise!, the old brakes now work as good as the new Brembos.. 



Max

[barny7655]

Up date on caliphers, the older style twin cams have a master of 11/16 , with a calipher piston size of 1 inche and 5/16 , the Brembos have a master 5/8 there calipher pistons measure 1 inche 1/4 , so we have a reduction on bore size of the master for the brembos 5/8, so ill be using the brembo 5/8 , just letting every one know there is a difference , to what happens if using the larger master 11/16 im not sure ,there are some  like my self changing over to brembo brakes ,we just have to do some home work before we jump in ,in a area that is some what seems straight forward but has a few hick cups , cheers Barny

[Ajayrk]

Now take that 5/8 master and put it one an earlier bike with pre-Brembo calipers and surprise!, the old brakes now work as good as the new Brembos.. 



Max

Yep, Yep and Yep.

[Admiral Akbar]

And ... It's much cheaper..    Max

[Admiral Akbar]

This bring up a question.. Will the new brembo master work wit the old switch / throttle housing.. Did the banjo bolt change?  Max

[barny7655]

Max, the bango bolts are not  the same  as the 11/16, the 11/16 older style  is 24 TPI,3/8 inch , the brembo is metric 1.0  ,10 mill dia,that is for the entire system calipher as well,, the older 3/8 feel as though they fit, but ive put my thread gauge on them , and ive checked fittment of the brake switch, looks like it will fit into the brake handle , ive done my controls for the clutch  , found the handle is further out from the bars but still meets  flush with handle bars when depressed.the controls on the left side all marry up ,the chrome master ive rekitted,just waiting for my pads to come from the states, lyndall  Z,ill flush my stainless lines and Tee with brake clean, before the new Dot 4 ,ill let every one know the result,all the parts im using are new ,cheers Barny

[Admiral Akbar]

Barny

Thanks for the reply,, Good thing is that 10mm is real close to 3/8..

Max

[redsled]

So, Barny? What happened? Did the Brembo master fit your old-style brake lever/perch/controls? I would love to do this trick on my 04 King.

[barny7655]

you have to have every thing late model brembo , the brake lever as well as master,the bango bolt is metric as my other post states,so are the calipher bangos,the other lines i had twin, i cleaned them with metho , not brake clean as brake clean wont rid old system of DOT 5, i got a clutch perch as well  with lever they will fit your hand controls, im changing the clutch to hydraulic brembo as well ,i have the master for that 11/16,  cheers hope this helps Barny

[jerry34208]

I have an '04 Ultra. I now have the brembo rotors/calipers (using the newer lines too) but still using the original master. My tech put a rebuild kit in the master (hope he cleaned it real good, 'eh?) before he changed over to the dot 4 fluid.

It's been about a year and 10K miles, all is well. Noticeably better feel to the brakes.

[barny7655]

the only difference is the brembo brake master is 5/8 ,and your other 11/16, the clutch is 11/16, others have used the 11/16 woth out any problems , cheers Barny

[Admiral Akbar]

the only difference is the brembo brake master is 5/8 ,and your other 11/16, the clutch is 11/16, others have used the 11/16 woth out any problems , cheers Barny

There is a 21% difference in the required pull to get the same stopping power between 5/8 to 11/16 masters.. Max

[jerry34208]

I think (dangerously) that 21% difference is offset somewhat by the fact that the Brembo rotors are a little larger in diameter. This would appear to increase leverage by having the swept area farther from the axle. Yes?

[Admiral Akbar]

Well what % is the increase is rotor diameter?

If the stock rotor is 12 inches then the new rotor would have to be  over 14 inches..

What is the net increase in caliper piston surface area?

Max

[jerry34208]

These things I do not know. IIRC it's about 1/4 to 1/2 inch. Not much. And I don't know the difference in the swept area or the area of the slave piston so in the end I don't know much. Just thinking out loud I guess.

Do you believe I'd get even better results if I were to go ahead and buy a Brembo master? I am happy with the current set up, just wondering if anyone has similar experience.
Thanks.

[Admiral Akbar]

If you want ligher brake pull..  Remember that there can be a slight trade off.. Slightly mushier brake feel.. This can be corrected some by upgrading the lines.. (I'm pretty sure the stock calipers flex equal or less then brembos)   

As with any change sped time getting used to the brake performance difference. In this case lighter pull.

Max

[jerry34208]

I'll probably keep it as it is. I like having the harder lever. No mush. The newer lines that came with the Brembo calipers don't flex or give like to older stock lines either. I think they are a braided line covered with black plastic. Anyway it's good.
Be safe.