What Master Cylinder

[V8COOPMAN]

Originally Posted by glennpm

I currently have a stepped bore master in my 32. The stepped bore was designed for moving a large volume of fluid quickly to take up the gap in early Chevy applications.

The advantage is that the initial 1/4" stroke takes up the gap and then the smaller N bore takes over. The pedal stay6s high without a lot of pedal travel.

Hey Glenn.....This is an interesting piece for me, as I had never heard of this "stepped-bore" cylinder design. If I am fully understanding the concept, one of these type M/Cs sounds like it would preclude the pedal from running out of stroke because of the initial "quick-fill" feature. Then, once the shoes have contacted the drums and initial system pressure begins to increase, the SMALLER DIAMETER than usual M/C bore should ultimately cause higher pressures to develop against the shoes, WITHOUT the increased foot pressure on the pedal. Kind'a like killin' both birds with one rock! Am I understanding this correctly, or am I full of it again? Appreciate you posting this info, Glenn! Coop