Power brake question

[akrapovic]

I just installed c5 front and rear brakes in my car. I'm wondering if I will have enough vacuum to run a DSE master/booster. My cam specs are as follows:

242/250
.595/.595
LCA=114. Cam is installed at 111

This is a hydraulic roller cam.

Thanks in advance

[Payton King]

at idle?

You could always go with a 7/8 master from wilwood and just run a manual set up as well.

[akrapovic]

Sorry, yes I meant at idle. I may have to consider the manual option. I'm hoping I'll get 14-15" at idle but I don't think it's going to happen.

[akrapovic]

Screw it, going manual. Thanks Payton.

[ProdigyCustoms]

Only problem with going manual on those brakes is those are designed as power brakes. Wilwood brakes like Payton is running are designed as manual brakes, designed to work on less pressure. I have not heard a lot of sucsess storys of factory C5 brakes in manual brakes. You may find to run manual brakes you need the volume oif a 15/16" and the pressure of a 7/8", which of coarse is impossible to do.

[Vegas69]

If I had it to do all over again, I would go hydraboost. JMO

[Payton King]

You could also use a product from ABS that is an electric power brake system. http://www.abspowerbrake.com/electrichppage.html

[wedged]

You may find to run manual brakes you need the volume oif a 15/16" and the pressure of a 7/8", which of coarse is impossible to do.


The stroke of the 7/8" would need to increase by about 20% to equal the volume for a given stroke of the 15/16". Pressure would not be generated until the caliper pistons squeezed the pads against the rotors. You would need to make sure you had enough stroke available and the right pedal ratio. The issue is if the parts exist to make it happen.

A dual master set up might work for something like this ?

[ProdigyCustoms]

If I had it to do all over again, I would go hydraboost. JMO

You would HATE it, way over boosted feel with your big brakes. Imagine autocrossing and trying to push the gas pedal through the floor one second, then laying you toe gently on the brake pedal to keep from skidding into the corner. It is difficult at best.

[Vegas69]

I guess I should drive a car with hyrdaboost before I open my big yapper. I'm just not that crazy about my manual brakes. I've been driving BMW's to long. As little as I drive the car, the change feels to dramatic.

[ProdigyCustoms]

Understood, it is a different feel, but is great in racing situations, takes getting used to on the street though

[XcYZ]

I disagree, Frank. I have over 7,000 miles on my car now which has an assist unit and C6ZO6 brakes. They're great, I wouldn't change a thing. And it takes more than just a toe to lock up my brakes - I think that's an extremely misleading statement.

[Vegas69]

Frank and I are pretty candid with eachother since we've become friends over an entire build and beyond. Just so you don't think he's picking out some random member.

[wedged]

Hydratech Braking Systems Are the best muscle car hydraulic brake boosters.

That only compares them to other hydraulic brake boosters, not manual systems ?


Ok, so NO ONE has any input on the possible solution of using a dual MC to get both volume and the required pressure ?

http://www.speedwaymotors.com/RS/SR/Product/91029975_R.jpg

[Payton King]

Most would not like going through the fabrication process. If I had to do it all over again, I would go with a tandem master from Wilwood in a manual configuration or power brakes.