brake bias with 2 single master cylinders

[skull]

l am running 2 afco single master cylinders for my brakes on the 30 dodge. one master has the lines running to the front, the other to the rear. l have the set up where the brake pedal activates both of them. on the pedal bracket is an adjustment to set either the front to engage first or the rear to engage first.

which should engage first?

been told several different answers[S

so l'll throw it it here and see what the nation thinks.

Later

 

[klink]

I think the adjustment your referring to is the bias bar. You use this to change the effort (force) applied to each brake system. Here's a link that might help.
http://www.stockcarproducts.com/tech1k.htm

 

[jfg455]

you want more front brake as this is where all the wieght goes. But the braking force difference can be due to the brake size on each axle EG: larger front brakes = more force with the same pressure. I will usually set them up to where they will lock all 4 wheels at the same time.

 

[Sam_Fear]

So why do you need one to engage before the other? Seems to me that would be delaying full braking capacity. I understand why you want more force on the fronts due to weight transfer, but I'm missing something on the delay?

 

[Dr Crankenstein]

We ran a similar setup on a funny car some years ago. With no proportioning valve and separate masters, it was necessary to have adjustment for front/rear bias so the system could be tuned properly. It's not a delay so much as it is a means to balance the two systems.

Read the link Klink posted. That's exactly what we had, and I assume skull has something similar.

 

[skull]

thanks

thank you klink.

that is the exact system l have and the info on that link answers my question of how to set it up.


Later

 

[rainman]

Look at a two reservoir master cylender, one closest to the firewall will engage slightly ahead of the other! Front brakes go to the rear, rear bakes to the front!

 

[Old Iron]

We used that setup on our latemodel circle track cars with pressure gauges in both lines so we new how much bias we were actually runnin

 

[Ricks Garage]

We ran the same setup on both of our dirt modifieds. it depends on if you have drum or disk rear. On the drum brake car we set it up to engage the rear first because it would keep the pedal high. The balance bar was used when the track changed and I needed a little more front brake. We also ran an adjustable porportioning valve. On the four wheel disk car we ran that one with the same pressure front and rear. A residual valve keep the pedal high. That can only needed a slight change in the balance bar during a race. You need to drive the car and setup the brakes so not to lock up the front brakes first.