Drag Racing Discussions > Front Engine Dragsters

Brake MC Diameter

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lake_harley:
I'm debating what diameter master cylinder I should buy to use on my FED. I have a 3/4" bore MC on my T roadster hot rod and even with 4 wheel brakes (discs) I have good brakes and a reasonable amount of pedal travel (not excessive). Thinking with just rear brakes on the FED I'm building I might go to 5/8" to get a bit more line pressure without excessive foot pressure or pedal travel using about a 5.5:1 or 6:1 pedal ratio. Since I'm not planning to use a trans brake I'm thinking the higher line pressure using a smaller diameter MC might help hold the car on the line just foot braking.

Thoughts and experience based on what you have in your car for MC diameter and pedal ratio?

Thanks

Lynn

BK:
The link should take you to the Mark Williams site brake info.
https://www.markwilliams.com/calculators.html

lake_harley:
Thanks. Helpful calculator.

Lynn

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