Best superbike style front master cylinder

[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...ash=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

 

[GregT]

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

They were Suzuki Impulse calipers. That will mean nothing to most as the US never got that bike. They're a slightly smaller version of the early GSXR 4 pots which use the same size pistons - and the same pads. Just packaged a little smaller. Used them on an F3 Kawasaki twin here and lost the Wanganui street race when the rider got arm pump. It had been his decision and insistence to use the 5/8in M/c....

 

[limeex2]

And to get those caliper pistons out. I have one of these. It works like a vise grip in reverse. No blowing them out, no vulcan death grip on some pos tool. I dont have many special tools but this one is sweet. http://www.ebay.com/itm/Kawasaki-ZR...ash=item3d0ec59599:g:dbgAAOSwKtlWmC4m&vxp=mtr