57 Chevy with power front disc brakes. Brakes are marginal at best. Booster is good, new, bench bled m/c. I am wondering if since this was not power brake car originally, if the throw of the brake pedal is wrong. Can this be corrected with a different m/c, or do I need to drill a hole in pedal arm, and if so where? Thanks
What is your vacuum reading on your engine? Do you have a vacuum reservoir with appropriate check valves? If you've got a radical cam you may not be developing enough vacuum for the brakes to work well. You might need a vacuum booster that was used in the mid 80s GM cars. Let me know if you'd like instructions on how to put that in..
Check this article for pedal ratio info: https://techtalk.mpbrakes.com/how-to-series/calculating-pedal-ratio
If anything the brakes should be grabbing stronger with the manual position ratio of the pedal. So if your brakes aren't as good as you like, moving the hole closer to the pivot point will only make things worse. Is the master cylinder for a disc/drum setup, and not a drum/drum master? Not having the correct master could easily result in poor brakes.
Why is everyone yapping about pedal ratio when such things as diameter ratios of the master to front and rear caliper/drum pistons, available vacuum, proportioning valve, etc. etc. are generally the issue with modified braking systems???
What he said^^^^^^^ In actual measurments, as in bore sizes. Saying "mustang MC" means nothing in the real world
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