Hoping some brake knowledgable people can answer some questions & help me figure out some ideas I have. Open to ideas, suggestions and/or constructive criticism On my Aspen wagon I have a lot more pedal travel than on my Dart Sport. (race cars) with the same manual disc master cylinder (1.03" bore). Aspen doesn't have a proportioning valve & Dart Sport does. Aspen apparently had a "Z-bar" lever for the brakes that the previous owner eliminated. Pushrod is at an angle which can contribute to more travel, but it has worked well for him for years and for me so far (Just the extra travel bothers me.). 1) Is there a way to tell if any extra travel is due to air in the system or because F-body calipers are bigger than A-body calipers (2.75" vs 2.60")? Or can the proportioning valve or lack of have an effect on travel, in addition to the angled pushrod? 2) Should a bigger bore master cylinder provide a slightly quicker release of the brakes than a smaller bore/longer travel M/C.? (Think drag racing RT's.) Thinking about adding a truck/van master cylinder with a bigger bore (1.125") to compensate for the bigger F-body calipers and pushrod angle. Probably should get a non-Z-bar pedal & pushrod, but finding one plus installation time makes it impractical at the moment.