master cylinder for vette brakes

[sacarguy]

vete pbr fronts and 02 camaro rears.

what master cylinder bore size for manual master cylinder.

i plan on installing a billet master cylinder just wondering what bore size i should go with.

i was looking at this cylinder so i can adjust the rear bias

http://www.abspowerbrake.com/images/...557_masCyl.jpg

the center one 1373 wich has the porpotioning valve built in for clean plumbing

i just need to know what bore size to run for manual brakes with these calipers.

[MarkM66]

What vette calipers?

I think most that run a manual system, use a bore size smaller then 1".

[Apogee]

If you're running C4 front calipers, a 7/8" master cylinder is preferred. If you're running C5/C6 front calipers, 7/8" to 15/16" bore master cylinder.

Tobin
KORE3

[Rick Dorion]

Sorry for this hijack but what would be good for a C4 front and stock rear drums for my 68 in manual mode. On my 69 I tried a 15/16 mc and the effort was too high although going to HP plus pads helped.

[Apogee]

Originally Posted by Rick Dorion

Sorry for this hijack but what would be good for a C4 front and stock rear drums for my 68 in manual mode. On my 69 I tried a 15/16 mc and the effort was too high although going to HP plus pads helped.

Rick, 15/16" bore MC with C5/C6 front calipers is virtually the same as 7/8" bore MC with C4 calipers (12-13% difference in area for both the calipers and the MC's). Your pedal travel shouldn't be excessive with the 6:1 pedal ratio, but definitely check it after installing the smaller bore MC. I've been meaning to look at whether there is a compatible, smaller bore rear wheel cylinder to reduce pedal travel since the MC is now generating more pressure, but haven't yet found the time for that particular research project.

Tobin
KORE3

[Rick Dorion]

Thanks again, Tobin. What is a good manual 7/8" MC candidate?

[Apogee]

Originally Posted by Rick Dorion

Thanks again, Tobin. What is a good manual 7/8" MC candidate?

Wilwood's 260-9439 is a good 7/8" bore candidate for the money. I'm sure Frank at Prodigy/GP could hook you up.

Tobin
KORE3