I started with a 1 1/4 piston, like the factory one, but dual, the petal was so hard once the system was bleed, the push rod bent, So I went down to a 1" and the petal was better. If I go down any smaller the pressure will be higher with no volume, if go larger the petal might not even move. There is no hyravac assist.I was thinking of moving the master farther back and installing a 7" vacuum booster, but the fill hole will have to be under the seat. I had to move the master back to fit the brakes lines one the side.
