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Sweet Jesus I had no idea this was so complicated. I just bought a ⅝" Nissin master cylinder that looked the business and called it good
You might be right ... it must be the pivot ratio that makes up for the longer travel that would be required.Fot the total picture you nee to consider :
lever length and pivot ratio
mc piston area
total calliper piston area
disk ‘size’ at the effective radius
pad coefficient of friction
tyre coeeficient of friction
way too complex for me ! Hence focus on mc and caliper ratio, and pad grade ( aim for hh or at least gg)
Ya I'm just trying to understand the full theory behind it.Sweet Jesus I had no idea this was so complicated. I just bought a ⅝" Nissin master cylinder that looked the business and called it good
When i rebuilt the master i made sure this little hole was there and clear! I saw some bubbles come out of it at the start of my bleed process. It's gotta be something else.Don't know if this will help you, disregard if it's of no value. When I went to bleed the brakes on the Hedgehog I wasn't sure how it was going to go. Did the rear first, aftermarket reservoir, Yamaha R-1 master, and Kawasaki caliper. pumpity pump, pumpity pump, bleed bleed, and pretty soon everything was perfect. On the front it is another aftermarket reservoir, an aftermarket (probably ChinaBay) master, and Kawasaki caliper. pumpity pump, pumpity pump, no bleed. repeat, repeat, repeat, and on and on and on. Nothing. Finally did a little research and learned that there are two little holes in the master, an Intake Port and the Compensating Port (or something like that). I took the master apart and discovered that at the factory they had drilled the hole for the Intake Port but the hole for the Compensating Port hadn't been drilled all the way through. I checked the internet image again to make sure I wasn't being a dufus and then used a pin vice and a very tiny drill and completed that second hole. I made sure everything was cleaned out, put it all back together, and pumpity pump, pumpity pump, bleed bleed, and everything was perfect!
Like you, before I drilled out that little hole I had very little fluid and little to no pressure. Might be worth taking that master apart and check things out.
I did this and I have brakes!!!!! Thank you, sir.open just the bleed you are working on. I left lever in the out position. I have the double banjo so I did the caliper with the line closest to the MC first, then did the other.
This was my first dual caliper bleed!glad it worked. Like I said. I've never been able to get a multi caliper system bled from the mc. A single seems to be fine but the double I always have to do with the syringe