I have read many of the subjects dealing with this topic in the past on this site. But is it possible to do the swap and retain a manual master cylinder for four wheel disc or do all of the ones that have been talked about require a power booster? Also, I've read where you talk about a pro valve. Are you referring to a stock proportioning valve from a 4w disc car or somthing besides that or even added to it. Thanks for any help.

That's a loaded question.
There are several things to consider.

Manual disc brakes were offered on the 67 year Camaros only.
They seemed to work but as far as I know, it takes a fair amount of foot pressure to stop. Many people are happy with how it works, many report they are not happy.

Your success with manual discs will be greatly influenced by the following:
Car weight
Tire height
Brake rotor diameter
Caliper piston size
Master cyl size
Brake pad coefficient of friction
Pedal ratio
Speed

From what I have seen, if you have a big block Camaro with 26" tall tires, and go fast and want to stop with 11" dia stock rotors it will be very difficult. Meaning high pedal pressures, and poor braking performance.

If you have a small block with no or fiew options like AC and PS, and the tires are not too tall (14" or low profile) you might be happy going with manual brakes.

If you use a bigger rotor like a 12" or 13" I think the manual brakes will work much better, as they generate more torque at the tire tread. I've heard some good reports on them.

You must use a disc brake master cyl.
I have some more info on my first gen suspension page.
David

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Check my web page for First Gen Camaro suspension info:
David's Motorsports page (http://ourworld.compuserve.com/homepages/David_Pozzi/)
First Gen Suspension Page (http://ourworld.compuserve.com/homepages/David_Pozzi/first_gen_suspension.htm)
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer

David, My car is a street/strip car. It develops very little vaccum to operate a power booster. I suppose a vaccum can could help this problem,but I was trying to do this without doing a major brake overhaul.I guess this is'nt any different than any of those other quick little weekend fixes.LOL

You can help make the manual work better by:
Use short front tires
Use good front pads, try the carbon metallic performance friction type.
Use a 1" bore master cyl. You might try a 15/16" master cyl later after trying a 1" bore master. The smaller bore will ease pedal pressure if you find it too high, but will increase travel. So I'd try the 1" first, that's what the factory used in the 67 manual disc system.

I can't tell you much specifically about what will work because I know nothing about your car.
You have not provided any information on what car you have or are working on (I'm guessing it's a 71 camaro).
What the weight is, type and size brakes you have. Is this a big block car and how fast are you going at the end of the quarter?

Since the 71 had no manual option, I doubt it has a hole higher up on the brake pedal, which would be needed for a manual conversion.

If you want to just keep a power system and help it along do the shorter tires, better pads, and add a vaccum can or even an electric vaccum pump.
David

------------------
Check my web page for First Gen Camaro suspension info:
David's Motorsports page (http://ourworld.compuserve.com/homepages/David_Pozzi/)
First Gen Suspension Page (http://ourworld.compuserve.com/homepages/David_Pozzi/first_gen_suspension.htm)
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer

[This message has been edited by davidpozzi (edited 01-28-2001).]