Audi-Porsche-Corvette brake combo on a Chevelle?

[Tiger]

as for brakes on my Chevelle do you have any idea if this combo could/would work or if I need other parts, valves or stuff.

my idea:
Master cylinder: C4 corvette master which I'd bolt to the original booster.
Lines: 3/16" all around
Front: the rotors are 360mm (14 1/8") Audi RS4 units, the calipers are six piston Porsche brembo's. I'd do the line as this: Corvette master front port to a tee fitting, then one line to each front caliper
Rear: the rotors and calipers are standard 1985 Corvette c4, I'd do the lines as this: Corvette master rear port to wilwood adjustable prop valve then to a tee fitting, then one line to each rear caliper

thanks!

[andrewb70]

This might help:

https://www.pro-touring.com/forum/sh...ad.php?t=22159

Andrew

[Tiger]

thanks Andrew, It helps as for the size of the master but i'd like to know if my line routing is good as well, any idea?

front: Corvette master front port to a tee fitting, then one line to each front caliper
rear: Corvette master rear port to wilwood adjustable prop valve then to a tee fitting, then one line to each rear caliper

thanks

[andrewb70]

thanks Andrew, It helps as for the size of the master but i'd like to know if my line routing is good as well, any idea?

front: Corvette master front port to a tee fitting, then one line to each front caliper
rear: Corvette master rear port to wilwood adjustable prop valve then to a tee fitting, then one line to each rear caliper

thanks

Well if you were to go with a dual setup, like the one offered by CNC, then it would be fairly simple to route the lines.

Front: front MC----T----left/right caliper
Rear: rear MC-----T----left/right caliper

With the balance bar and properly sized MCs there is no need for a prop valve.

Andrew

[Tiger]

thats right, but if possible I'd rather save the cash and use the parts I have (prop valve and the Corvette master) if thats possible.
as for the cnc, how much is it and could I still use the booster??

will I need residual pressure valves in my system?

thanks again!

[nitrorocket]

The C5 master is better!

[Tiger]

NICE!!


are you you using residual pressure valves?


thanks!

[nitrorocket]

No, You do not run residuals with disc brakes, only if the master is LOWER then the brakes like in a rod. They will drag if you do.

[93Polo]

FWIW on my C5 I ran a http://www.movit.de/ kit using Brembo Big Reds off a 993TT on the front and factory rear brakes with no proportioning valve or master cylinder changes. The system worked great excellent pedal feel. BlueWasp on Corvetteforum has a 6 piston Movit kit on his C4 which is most likely a Brembo caliper as well. You may want to read his posts to see if he made any changes to the braking system.

[Tiger]

Cool guys, thanks!

I'll give it a try as is and eventually upgrade the master afterwards.

[jeffandre]

No, You do not run residuals with disc brakes, only if the master is LOWER then the brakes like in a rod. They will drag if you do.

I have been told by two sources to run a 2 pound residual valve to the front and to the rear, for a manual 4-wheel disc system. Is this really going to negatively affect my braking performance? I will be running Alcon 6-piston fronts and front C5 calipers on the rear. Sorry to hijack the thread, but the residual valve question is important to me too. Thanks,

[nitrorocket]

The residual valve is used to hold a certain pressure between the balve and the brake cylinder. This was standard in all drum and rear drum cars to help the brakes react quicker. They could handle this because the strong springs holding the shoes inward to overcome the 2psi residual pressure. These are also used on rods with real low masters to keep fluid from running back to the master.
On a 4 wheel disc car, this pressure will cause the brakes to drag, In fact the newer calipers were designed to have less drag then older units in order to increase performace and economy. Who told you to run them? Are they reputable? Did you ask what was there reasoning?? Maybe they know something I dont?

[jeffandre]

The MC manufacturer, CNC, told me to run the residual valves, as did the company I ordered the parts from. They didn't really give a reason, just stated that I needed them. Sounds like I need to call them on Monday to ask more questions and probably cancel the residual valves order, which saves me $55! Thanks for the reply!

[Tiger]

hi Jeff, pls let us know what they say.

thanks

[jeffandre]

I spent some time yesterday running down an answer to my question about the need for residual valves for my specific 4-wheel disc brake setup and car. The phone call and Internet searching led me to ATS, and Tyler returned my call promptly and recommended against using them. Thanks Tyler!