Best superbike style front master cylinder

[Guest]

Tried the later 20014 12mm ex650 unit ..... looks vastly better but with 850/1000/1100 calipers and braided hoses it just doesn't work.
the earlier square 5/8 piston one works admirably

[GS1150Pilot]

Are there cheaper sources for new ones than Bike Bandit? Criminy-$330?

[sharpy]

we used a RC30 style on our race Kat and was pretty awesome

[GS1150Pilot]

The RVT unit looks pretty ideal.

[Guest]

all radial's are 5/8" bore size.

Be careful about that, many newer sport bikes will have larger M/C bores than that. My 2006 GSXR1000 has a 19mm bore on the front master cylinder.


Mark

[GS1150Pilot]

I believe I need a 13 mm bore, so 1/2".

[Guest]

I believe I need a 13 mm bore, so 1/2".

That would be unusually small for a dual caliper set up, the vast majority of them are a 16mm bore. According to partzilla the master cylinder piston and cup set is the same part number for your 1150 as the early GSXR's, so you want the same bore size as whatever your 1150 has stock to properly match up with the GSXR calipers.


Mark

[GS1150Pilot]

Would there be negative repercussions for, say, going slightly larger on the bore of the m/c? Is that a situation where something like a proportioning valve would be necessary, or is a small increase in m/c bore not a big issue?

[Guest]

Ive also used a lot of these on assorted race bikes, not as good as the RC51 unit or later radials but good enough and cheap !!!

http://www.ebay.com/itm/98-01-HONDA-SUPER-HAWK-1000-VTR1000F-FRONT-BRAKE-MASTER-CYLINDER-/271519978783?hash=item3f37da151f:g:x-8AAOSwewJTmMts&vxp=mtr

[GS1150Pilot]

I like that price! Danke schoen!

[GregT]

Would there be negative repercussions for, say, going slightly larger on the bore of the m/c? Is that a situation where something like a proportioning valve would be necessary, or is a small increase in m/c bore not a big issue?

I can tell you from experience that using a 5/8in bore M/c on a pair of 4 pot calipers led to arm pump. It was a very "wooden" feel.
Going to the correct 12mm M/c for those calipers was like night and day....

I use a lot of big 2 pot Brembos on race bikes. Std M/c size for a pair of those is 15 or 16mm. Going to a 14mm M/c gives a much better feel and more power too. So a small size difference can make a big difference in feel.

[GS1150Pilot]

Once again, Greg-thanks!

[limeex2]

I can tell you from experience that using a 5/8in bore M/c on a pair of 4 pot calipers led to arm pump. It was a very "wooden" feel.
Going to the correct 12mm M/c for those calipers was like night and day....

I use a lot of big 2 pot Brembos on race bikes. Std M/c size for a pair of those is 15 or 16mm. Going to a 14mm M/c gives a much better feel and more power too. So a small size difference can make a big difference in feel.

That's why I mentioned an EX500 that uses a 1/2" bore...

[GS1150Pilot]

Definitely lots of help here, guys, and thank you again!

[Guest]

I can tell you from experience that using a 5/8in bore M/c on a pair of 4 pot calipers led to arm pump. It was a very "wooden" feel.

Greg,

What calipers were those? The 5/8" bore MC and twin four pot calipers was the standard Jap sportbike set up all though the 90's into the early 2000's when big radial calipers became the norm. My 82 1100E is also running a 5/8" bore MC with salty_monk's brake upgrade setup and it is fine as well.


Mark