Power Brake pedal ratio , does it change with bell crank ?

[rustytoolss]

Manual brake pedal ratio is 6 to 1. Power brake pedal ratio is 4 to 1 , But the power brake linkage goes through a bell crank assy and thing change. So does the 4 to 1 ratio change ? if so what does it become ?????

 

[R/T Boy 67]

The bellcrank changes the ratio, but my best guess is that it is 4 to 1 after the bellcrank. I don't have one to look at right now. It needs to be removed for manual brakes. You need a manual brake pushrod, and the firewall reinforcement plate probably needs to be changed also.

 

[rustytoolss]

The bellcrank changes the ratio, but my best guess is that it is 4 to 1 after the bellcrank. I don't have one to look at right now. It needs to be removed for manual brakes. You need a manual brake pushrod, and the firewall reinforcement plate probably needs to be changed also.

I was just trying to find out if the ratio changes, to figure out master cylinder bore size/pressure if I stay with the power brakes.

 

[Dipstick]

The bellcrank changes the ratio, but my best guess is that it is 4 to 1 after the bellcrank.

The bellcrank allows the same pedal to be used for both manual and power brakes.