A little help from the Pozzi's with my brake master

[69496]

I noticed Mary's camaro has the same dual brake master cylinder as the one I got a while back to put in my 2nd gen. I was hoping to pick your brains for some pointers on install and setup of that master. Such as which side did you hook up the front and rear brakes to (although I don't think it matters)? How much did you have to adjust the bias bar (balance bar)? Although I have messed with it back and forth already so I have no idea where it was originally. How did you connect to brake pedal? The clevis that came with the brake pushrod I bought doesn't line up. I was thinking of using a rod end instead. And finally your general thoughts and opinions of the master and anything else you can tell me to help? I really like your cars and you two have had a big impact on my interest in the sport. I will follow up with a pic or two

[69496]

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[a67]

Not sure about the other questions, but the larger {edit, was: smaller} diameter M/C is for the rear brakes.

Bob.

[Peter Mc Mahon]

Isn't smaller bore master cylinder for the front brakes? Higher pressure?

[a67]

Isn't smaller bore master cylinder for the front brakes? Higher pressure?

Yes it is, did I mess that one up, will edit my reply... Thanks for the correction.

Bob.

[Skip Fix]

Or does the front need the larger for the volume needed on the larger pistons?

[69496]

I have front and rear disc brakes (C5 corvette) so the bore is the same on front and rear master. However I thought I needed 1" bore and just noticed today they are both 3/4" bore. Hopefully I'm wrong and all works well when I get this hooked up. Feel like I should of stayed with a more traditional master cylinder set up by I'm going to stay positive and see how it all feels when done

[a67]

With dual M/C's and a balance bar the force applied to the brake pedal is divided between the two M/C's. So if you put 100 pounds of force on the pedal, with the balance bar centered, each M/C will receive 50 pounds of force. This is why the small 3/4" bores.

With a tandem M/C (inline style), both the front and rear sections would get the full 100 pounds of force. In this case a 7/8" or 15/16" M/C works best.

Bob.

[Peter Mc Mahon]

With dual M/C's and a balance bar the force applied to the brake pedal is divided between the two M/C's. So if you put 100 pounds of force on the pedal, with the balance bar centered, each M/C will receive 50 pounds of force. This is why the small 3/4" bores.

With a tandem M/C (inline style), both the front and rear sections would get the full 100 pounds of force. In this case a 7/8" or 15/16" M/C works best.

Bob.

I think that both masters would see 100 pounds of force. If the force dropped to 50, you would need to double the force that you input to achieve 100 pounds to either master?

[a67]

I think that both masters would see 100 pounds of force. If the force dropped to 50, you would need to double the force that you input to achieve 100 pounds to either master?

StopTech has some good papers on the various areas of braking systems. On dual M/C's:

http://dev.stoptech.com/docs/media-center-documents/pedalsetup-dualmaster-guide

Another one that covers front to rear proportioning that also includes dual M/C's:

http://stoptech.com/technical-support/technical-white-papers/proportioning-valves

Of course the link to the list of papers:

http://stoptech.com/technical-support/technical-white-papers

Bob.

[Skip Fix]

I have front and rear disc brakes (C5 corvette) so the bore is the same on front and rear master.

But pistons in the calipers are not the same size so more piston sq in = more brake fluid volume to move the piston the same distance as a smaller piston caliper. Front calipers almost always have more piston sq in than rears.
Often a "regular" style MC will have slightly different valving for front and rear as well as the proportioning valve reducing rear pressure

[69496]

But pistons in the calipers are not the same size so more piston sq in = more brake fluid volume to move the piston the same distance as a smaller piston caliper. Front calipers almost always have more piston sq in than rears.
Often a "regular" style MC will have slightly different valving for front and rear as well as the proportioning valve reducing rear pressure


Hence the balance bar I assume to adjust how much force front or rear. I know this master is on a couple 2nd gens and some other older cars but its new to me. I will provide some feedback with how easy or hard it is to setup as a complete amateur. Gonna be at least a couple weeks though.

[69496]

StopTech has some good papers on the various areas of braking systems. On dual M/C's:

http://dev.stoptech.com/docs/media-center-documents/pedalsetup-dualmaster-guide

Another one that covers front to rear proportioning that also includes dual M/C's:

http://stoptech.com/technical-support/technical-white-papers/proportioning-valves

Of course the link to the list of papers:

http://stoptech.com/technical-support/technical-white-papers

Bob.


Thanks for the links . Much appreciated.