The Yamaha Road Star Warrior Forum

I'm going down to one rotor in the front to show off the wheel more.  I understand to help compensate for this I need to go with smaller diameter line.  I was unaware of the factory size and that even though I choose the smaller diameter size, it was still not small enough.... I don't believe.

How do I make this lever/mastercylinder work with a single stock caliper?  Can I simply just run a smaller braided line?  Wrose case... are there set ups similar to this that'll work?

HHI  brake/mastercylinder 9/16" bore:  http://www.phatperformanceparts.com/ProductDetails.asp?ProductCode=HBMA%2DAS21&CartID=1

Ok... so to make sure I'm on the same page... banjo brake connector and the banjo screw.  Are those the fittings the line will go over to connect the line to the mastercylinder and the caliper?  Are you sure the 9/16" bore is small enough?  They only have 9/16" and 11/16" bores

 Thanks

The 9/16 should be perfect for you.

What is 9/16 in mm?  I have had the understanding you will need an 11 or 12 mm bore to improve brake function with a single front caliper.  I'm not sure of the exact conversion but it looks like that will be really close to what it will be.

if you measure the length i can give you a price in the line and fittings and make one up for you.

Sending PM now....

One Foot Engineering based on the enclosed photo tells me that the JOKER MC has a shorter pivot point, Dim 'X', as well as reduced piston stroke which might explain their recommended applications for single (9/16") & dual (11/16") disc frt brakes...

• Feature Joker's exclusive self-lubricating polymer piston and seal kits, also produced by Joker; special ball bearing-actuated piston rides in a hard-surface roller-burnished bore for more precise feel and longer life as the bearing glides across the piston as you engage the brake or clutch

The shorter Dim 'X' will result in an increase of leverage (higher psi) but at the cost of brake fluid displacement (less In³ of fluid to caliper/s)

When the front wheel is in motion the rotor & piston cups slightly repel the pistons.... Read this referenced thread:  Front brake constantly rubbing rotor?!?!? so the 9/16" MC displacement could be an issue with the 2-frt stock 4-piston calipers. Because of the shorter stroke the brake lever will hit the grips before suppling adequate displacement to push the pads against the rotor and allow for the compressibility of the fluid (yes, fluid is compressible)

• The Warrior MC displacement is undocumented as there is no info of the total stroke of the piston. My educated guess is approx 1/2" - 5/8" ??
• You'll want your new brake lines no longer than required and the inner membrane of the lines to be equivalent to Galfer's smaller design.
• With the dual caliper  install you will get better modulation, less fluid displacement and compressibility using a 3-pc hose which has less area.

HHI Billet Handlebar Brake Control

Stock Brake Lever-Warrior
View of 1.00" CL - Pivot Point to Piston Contact Screw. M8 Pivot Bolt Hole & M6 screw x 0.75 fine pitch th'd