Brake pedal ratio modifications

[IainXE]

Can someone check these measurements and give me any confidence it'll do what I require please?

Removed my brake pedal and took some measurements to get the pedal ratio, as I plan to ditch my servo assist in favour of a twin master-cylinder non-assisted bias-adjustable set-up.

Pics of pedal and measurements:





I make that 19cm between the pivot and the pedal, and 4.5cm between the pivot and the connecting rod hole. That gives a pedal ratio of 4.3:1.

If I redrill where the white dot is in the second picture, that's 3cm away from the pivot, giving me a better non-assisted ratio of 6:1.

Sound about right?

[IainXE]

Thanks for your input.

It's a vertical pedal and the link rod moves vertically into the scuttle area.

By your measurements I won't gain much by re drilling. Will have to suck it and see

[IainXE]

Not mainstream, and tester knows the dealio with modified cars so should be OK on test. Thanks for your confidence, hopefully should do what I need it to then. Would I be better off welding extra to the top of the pedal or just drilling where marked?

Bias box arrives today so I'll mock it all up and see how I get on.

Cheers

[IainXE]

So by that calculation I'm actually increasing the pedal ratio far too much, if its 45 degrees from the pivot point.

Impressive application of maths (to me anyway!) Thanks

[IainXE]

Great advice much appreciated sir.