poor stopping power

I've got a 46 Dodge pickup, I remove the power brake system ( to clean up firewall) the front frame in 77 camaro disc brake w/ 2 15/16 bore calipers. The power system had a 1.125 bore. I put on a 73 monte carlo manual master cyl with a 1.00 bore ( just a note: a 73 monte had a 1.125 power bore so thats why I went with what the 1.00 bore just as chevy did).
My pedal ratio is 5.6/1....I am using the same properationing valve that was on the power system.
The onlt things I've changed was going to a manual master cyl/ and changing the pedal ratio from 4/1 to 5.6/1
my pedal is good..but it takes alot of effort to stop the truck. I've had manual brakes before/ they all needed more pedal effort, but not like this.
I've just put on a set of semi metalic pads/ but it did not help much.
I'm not afraid to drive it...BUT not happy with how it works.
Any ideas what I should do?
I might be able to increase the ratio a bit to get 6/1, but I think maybe I've got something else going on here.
Oh yeah ...disc/ drum system, master on firewall

 

try for 6/1 or a little more if possible. leverage is your friend.

 

Do you want the firewall to look clean wrapped around the back of the motor where you ran into whatever because you couldn't stop?


I mean not to be a dick but it seems like the easiest way to make it stop better would be to put some kind of booster back in there and since it has a hood and you drive with the hood closed, not worry about WTF it looks like. That's all... your truck, do what you like.

 

How heavy is that Dodge pickup? You got a braking system that was designed to stop a 3000 lb. car... If your rolling 5000-6000 lbs in that truck, well...

When you lock the wheels in a panic stop, what locks first? Front or rear? What are the rear brakes off of? [basically wondering how mis-matched the system is]

How about the brake petal itself... Any binding, side loading, or mis-alignment there?

Where did you get the Monte Carlo M/C from? Off a driving car? Or off the shelf at Autozone? Maybe defective????

 

I recomend installing a midland booster somewhere under the truck. You only need to power the front brakes. I have done this on seversl vehicles, and it works great.

 

The truck weighs 3500 about the weight of a mid size car/ and the rear brakes and axle are from the 77 camaro 10" drum brakes,. the pedal is not binding or coming in contact with anything.
I may be able to increase the ratio abit...thanks for your help.

 

As for the master cylinder it came from NAPA

 

Just throwin' this out there...but I believe the original master cylinder mounted under the floor on that truck. Are you sure the firewall has been reinforced enough to cope with the extra pedal force the manual brakes require? If the firewall is flexing, you are losing pedal force and braking effort. The power brakes wouldn't have that problem because the booster is mounted outside the firewall. Might be worth checking into if you're not sure.