Brake modification

wallstyledruckus · Mar 23, 2022

I have a set of the yellow dot r1 brakes. The blue dots came from the r6 and have a steel piston. The r1 has an aluminum piston. I’m pretty happy with the feel but I think the stock master is lacking.

Fire-medic · Mar 23, 2022

1998 R1:

Blue dot calipers.

2001 R6:

Also blue dots.

The 2005 R6 had radial-mounting brakes and an USD fork with the yellow inserts:

Phil_good1965 · Mar 23, 2022

Fire-medic said:
The correct ratio often mentioned is equal to 16 mm where the Gen. 1 VMax is 5/8 or 15.875 mm, so I doubt that .007% of a difference (16 mm vs. 5/8") is going to be noticeably by anyone under any circumstances.

Mr. Midnight has in the past referenced using a 14 mm master cyl diameter, with the R1 non-radial brakes (1998-2003) and he said it made a significant difference. (27) R1 front calipers upgrade | Yamaha Star V-Max VMAX Motorcycle Discussion Forum (vmaxforum.net) post #15

Trying to find info for specific master cyl diameters for bikes can be difficult. Here is a cornucopia of brake info: (26) Master cyl bore sizes of Japanese bikes and calculation chart for proper sizing | Yamaha Star V-Max VMAX Motorcycle Discussion Forum (vmaxforum.net) This would be a good one to bookmark, as it contains lots of info for determining what works, and what doesn't work well.

Phil_good1965 · Mar 23, 2022

Yzf 1000 calipers , standard max master cylinder. A substantial improvement

Equanish · Mar 23, 2022

02GF74 said:
I cannot say I have found the standard brakes (4 pot) lacking in anyway but the mod monkey won't stop jabbering and is making work for idle hands.....

So I have accumulated and cleaned up a pair of Sumitomo 6 pot callipers and R1 blue spot callipers (actually silver spot).

I also find the Vmax clutch lever is further out than I would like (and I don't have small hands!!) so have a set of after market adjustable levers and a set XJR1300 brake and clutch master cylinders which have 5 position lever adjustment. The brakes have a smaller bore to match the R1 blue spot callipers.

So there are quite a few combinations to fit, in order of preference

1. XJR1300 master with 6 pot callipers; the brake lever travel will increase (31mm to 35mm) - not sure that is going to be a problem
2. Vmax masters with after market levers, assuming they fit? and 6 pot callipers
3. XJR1300 masters with R1 callipers (100% compatability)

I would be fitting braided hoses so the position of the outlets on the masters and inlet on callipers may need longer than stnadard hoses.

Opinions and comments?

jus put braided lines on... best thing for vmax no y fitting man what a difference the 2 second rule while driving is possible now.

Equanish · Mar 29, 2022

wallstyledruckus said:
I have a set of the yellow dot r1 brakes. The blue dots came from the r6 and have a steel piston. The r1 has an aluminum piston. I’m pretty happy with the feel but I think the stock master is lacking.

lite rotors and titanium bolts make a difference [when braking]

heh heh